30194830563

Committed 26 Jul 2026 08:33AM UTC coverage: 91.157% (-1.2%) from 92.38%

Build # 30194830563

Build Type

Pull #175

github

Committed by

web-flow

Commit Message

Merge e991bc12f into 57c7fca16

Pull Request Pull Request #175: Fix PHPStan blind spots and runtime edge cases in Arrayy; add audit and tests

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92.43

/src/Arrayy.php

<?php

declare(strict_types=1);

namespace Arrayy;

use Arrayy\TypeCheck\TypeCheckArray;
use Arrayy\TypeCheck\TypeCheckInterface;
use Arrayy\TypeCheck\TypeCheckPhpDoc;

/**
 * Arrayy - Methods to manage arrays.
 *
 * ## 🇷🇺 Русским гражданам
 * В Украине сейчас идет война. Силами РФ наносятся удары по гражданской инфраструктуре в [Харькове][1], [Киеве][2], [Чернигове][3], [Сумах][4], [Ирпене][5] и десятках других городов. Гибнут люди - и гражданское население, и военные, в том числе российские призывники, которых бросили воевать. Чтобы лишить собственный народ доступа к информации, правительство РФ запретило называть войну войной, закрыло независимые СМИ и принимает сейчас ряд диктаторских законов. Эти законы призваны заткнуть рот всем, кто против войны. За обычный призыв к миру сейчас можно получить несколько лет тюрьмы.
 * Не молчите! Молчание - знак вашего согласия с политикой российского правительства.
 *  **Вы можете сделать выбор НЕ МОЛЧАТЬ.**
 * ---
 * ## 🇺🇸 To people of Russia
 * There is a war in Ukraine right now. The forces of the Russian Federation are attacking civilian infrastructure in [Kharkiv][1], [Kyiv][2], [Chernihiv][3], [Sumy][4], [Irpin][5] and dozens of other cities. People are dying – both civilians and military servicemen, including Russian conscripts who were thrown into the fighting. In order to deprive its own people of access to information, the government of the Russian Federation has forbidden calling a war a war, shut down independent media and is passing a number of dictatorial laws. These laws are meant to silence all those who are against war. You can be jailed for multiple years for simply calling for peace.
 * Do not be silent! Silence is a sign that you accept the Russian government's policy.
 * **You can choose NOT TO BE SILENT.**
 * ---
 * - [1] https://cloudfront-us-east-2.images.arcpublishing.com/reuters/P7K2MSZDGFMIJPDD7CI2GIROJI.jpg "Kharkiv under attack"
 * - [2] https://gdb.voanews.com/01bd0000-0aff-0242-fad0-08d9fc92c5b3_cx0_cy5_cw0_w1023_r1_s.jpg "Kyiv under attack"
 * - [3] https://ichef.bbci.co.uk/news/976/cpsprodpb/163DD/production/_123510119_hi074310744.jpg "Chernihiv under attack"
 * - [4] https://www.youtube.com/watch?v=8K-bkqKKf2A "Sumy under attack"
 * - [5] https://cloudfront-us-east-2.images.arcpublishing.com/reuters/K4MTMLEHTRKGFK3GSKAT4GR3NE.jpg "Irpin under attack"
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @template TKey of array-key
 * @template T
 * @template TData of array<TKey, T>
 * @extends \ArrayObject<TKey,T>
 * @implements \IteratorAggregate<TKey,T>
 * @implements \ArrayAccess<TKey,T>
 */
class Arrayy extends \ArrayObject implements \IteratorAggregate, \ArrayAccess, \Serializable, \JsonSerializable, \Countable
{
    const ARRAYY_HELPER_TYPES_FOR_ALL_PROPERTIES = '!!!!Arrayy_Helper_Types_For_All_Properties!!!!';

    const ARRAYY_HELPER_WALK = '!!!!Arrayy_Helper_Walk!!!!';

    /**
     * @var array
     *
     * @phpstan-var array<array-key|TKey,T>
     */
    protected $array = [];

    /**
     * @var \Arrayy\ArrayyRewindableGenerator|null
     *
     * @phpstan-var \Arrayy\ArrayyRewindableGenerator<TKey,T>|null
     */
    protected $generator;

    /**
     * @var string
     *
     * @phpstan-var class-string<\Arrayy\ArrayyIterator<TKey,T>>
     */
    protected $iteratorClass = ArrayyIterator::class;

    /**
     * @var non-empty-string
     */
    protected $pathSeparator = '.';

    /**
     * @var bool
     */
    protected $checkPropertyTypes = false;

    /**
     * @var bool
     */
    protected $checkForMissingPropertiesInConstructor = false;

    /**
     * @var bool
     */
    protected $checkPropertiesMismatchInConstructor = false;

    /**
     * @var bool
     */
    protected $checkPropertiesMismatch = true;

    /**
     * @var array<array-key,TypeCheckInterface>|TypeCheckArray<array-key,TypeCheckInterface>
     */
    protected $properties = [];

    /**
     * @var array<string, true>
     */
    protected $optionalProperties = [];

    /**
     * Initializes
     *
     * @param mixed  $data                         <p>
     *                                             Should be an array or a generator, otherwise it will try
     *                                             to convert it into an array.
     *                                             </p>
     * @param string $iteratorClass                optional <p>
     *                                             You can overwrite the ArrayyIterator, but mostly you don't
     *                                             need this option.
     *                                             </p>
     * @param bool   $checkPropertiesInConstructor optional <p>
     *                                             You need to extend the "Arrayy"-class and you need to set
     *                                             the $checkPropertiesMismatchInConstructor class property
     *                                             to
     *                                             true, otherwise this option didn't not work anyway.
     *                                             </p>
     *
     * @phpstan-param TData|self<TKey,T,TData>|\Traversable<TKey,T>|callable|object|scalar|null $data
     * @phpstan-param class-string<\Arrayy\ArrayyIterator<TKey,T>> $iteratorClass
     */
    public function __construct(
        $data = [],
        string $iteratorClass = ArrayyIterator::class,
        bool $checkPropertiesInConstructor = true
    ) {
        $data = $this->fallbackForArray($data);

        // used only for serialize + unserialize, all other methods are overwritten
        /**
         * @psalm-suppress InvalidArgument - why?
         */
        parent::__construct([], 0, $iteratorClass);

        $this->setInitialValuesAndProperties($data, $checkPropertiesInConstructor);

        $this->setIteratorClass($iteratorClass);
    }

    /**
     * @return void
     */
    public function __clone()
    {
        if (!\is_array($this->properties)) {
            $this->properties = clone $this->properties;
        }

        if ($this->generator !== null) {
            $this->generator = clone $this->generator;
        }
    }

    /**
     * Call object as function.
     *
     * @param mixed $key
     *
     * @return mixed
     *
     * @phpstan-param TKey $key
     * @phpstan-return false|T|array<TKey,T>
     */
    public function __invoke($key = null)
    {
        if ($key !== null) {
            $this->generatorToArray();

            return $this->array[$key] ?? false;
        }

        /** @var array<TKey,T> $return */
        $return = $this->toArray();

        return $return;
    }

    /**
     * Whether or not an element exists by key.
     *
     * @param mixed $key
     *
     * @return bool
     *              <p>True is the key/index exists, otherwise false.</p>
     *
     * @phpstan-param TKey $key
     */
    public function __isset($key): bool
    {
        return $this->offsetExists($key);
    }

    /**
     * Assigns a value to the specified element.
     *
     * @param mixed $key
     * @param mixed $value
     *
     * @return void
     *
     * @phpstan-param TKey $key
     * @phpstan-param T $value
     */
    public function __set($key, $value)
    {
        $this->internalSet($key, $value);
    }

    /**
     * magic to string
     *
     * @return string
     */
    public function __toString(): string
    {
        return $this->toString();
    }

    /**
     * Unset element by key.
     *
     * @param mixed $key
     *
     * @phpstan-param TKey $key
     */
    public function __unset($key)
    {
        $this->internalRemove($key);
    }

    /**
     * Get a value by key.
     *
     * @param mixed $key
     *
     * @return mixed
     *               <p>Get a Value from the current array.</p>
     *
     * @template TAccessKey of key-of<TData>
     * @phpstan-param TAccessKey $key
     * @phpstan-return TData[TAccessKey]|null|self<array-key,T,array<array-key,T>>
     */
    public function &__get($key)
    {
        $return = $this->get($key, null, null, true);

        if (\is_array($return) === true) {
            $return = static::create(
                /* @phpstan-ignore-next-line argument.type */
                [],
                $this->iteratorClass,
                false
            )->createByReference($return);
        }

        return $return;
    }

    /**
     * Add new values (optional using dot-notation).
     *
     * @param mixed           $value
     * @param int|string|null $key
     *
     * @return static
     *                <p>(Immutable) Return this Arrayy object, with the appended values.</p>
     *
     * @phpstan-param T $value
     * @phpstan-param TKey $key
     * @phpstan-return static
     *
     * @psalm-mutation-free
     */
    public function add($value, $key = null)
    {
        if ($key !== null) {
            $get = $this->get($key);
            if ($get !== null) {
                $value = \array_merge_recursive(
                    !$get instanceof self ? [$get] : $get->getArray(),
                    !\is_array($value) ? [$value] : $value
                );
            }

            /* @phpstan-ignore-next-line argument.type */
            $this->internalSet($key, $value);

            return $this;
        }

        return $this->append($value);
    }

    /**
     * Append a (key) + value to the current array.
     *
     * EXAMPLE: <code>
     * a(['fòô' => 'bàř'])->append('foo'); // Arrayy['fòô' => 'bàř', 0 => 'foo']
     * </code>
     *
     * @param mixed $value
     * @param mixed $key
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object, with the appended values.</p>
     *
     * @phpstan-param T $value
     * @phpstan-param TKey|null $key
     * @phpstan-return static
     */
    #[\ReturnTypeWillChange]
    public function append($value, $key = null): self
    {
        $this->generatorToArray();

        if ($this->properties !== []) {
            $this->checkType($key, $value);
        }

        if ($key !== null) {
            if (
                isset($this->array[$key])
                &&
                \is_array($this->array[$key])
            ) {
                $this->array[$key][] = $value; // @phpstan-ignore assign.propertyType
            } else {
                $this->array[$key] = $value;
            }
        } else {
            $this->array[] = $value;
        }

        return $this;
    }

    /**
     * Append a (key) + value to the current array.
     *
     * EXAMPLE: <code>
     * a(['fòô' => 'bàř'])->appendImmutable('foo')->getArray(); // ['fòô' => 'bàř', 0 => 'foo']
     * </code>
     *
     * @param mixed $value
     * @param mixed $key
     *
     * @return $this
     *               <p>(Immutable) Return this Arrayy object, with the appended values.</p>
     *
     * @phpstan-param T $value
     * @phpstan-param TKey $key
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function appendImmutable($value, $key = null): self
    {
        /**
         * @phpstan-return \Generator<TKey,T> $generator
         */
        $generator = function () use ($key, $value): \Generator {
            if ($this->properties !== []) {
                $this->checkType($key, $value);
            }

            foreach ($this->getGenerator() as $keyOld => $itemOld) {
                yield $keyOld => $itemOld;
            }

            if ($key !== null) {
                yield $key => $value;
            } else {
                yield $value;
            }
        };

        return static::create(
            $generator,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Sort the entries by value.
     *
     * @param int $sort_flags [optional] <p>
     *                        You may modify the behavior of the sort using the optional
     *                        parameter sort_flags, for details
     *                        see sort.
     *                        </p>
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     */
    #[\ReturnTypeWillChange]
    public function asort(int $sort_flags = 0): self
    {
        $this->generatorToArray();

        \asort($this->array, $sort_flags);

        return $this;
    }

    /**
     * Sort the entries by value.
     *
     * @param int $sort_flags [optional] <p>
     *                        You may modify the behavior of the sort using the optional
     *                        parameter sort_flags, for details
     *                        see sort.
     *                        </p>
     *
     * @return $this
     *               <p>(Immutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function asortImmutable(int $sort_flags = 0): self
    {
        $that = clone $this;

        /**
         * @psalm-suppress ImpureMethodCall - object is already cloned
         */
        $that->asort($sort_flags);

        return $that;
    }

    /**
     * Counts all elements in an array, or something in an object.
     *
     * EXAMPLE: <code>
     * a([-9, -8, -7, 1.32])->count(); // 4
     * </code>
     *
     * <p>
     * For objects, if you have SPL installed, you can hook into count() by implementing interface {@see Countable}.
     * The interface has exactly one method, {@see Countable::count()}, which returns the return value for the count()
     * function. Please see the {@see Array} section of the manual for a detailed explanation of how arrays are
     * implemented and used in PHP.
     * </p>
     *
     * @see http://php.net/manual/en/function.count.php
     *
     * @param int $mode [optional] If the optional mode parameter is set to
     *                  COUNT_RECURSIVE (or 1), count
     *                  will recursively count the array. This is particularly useful for
     *                  counting all the elements of a multidimensional array. count does not detect infinite recursion.
     *
     * @return int
     *             <p>
     *             The number of elements in var, which is
     *             typically an array, since anything else will have one
     *             element.
     *             </p>
     *             <p>
     *             If var is not an array or an object with
     *             implemented Countable interface,
     *             1 will be returned.
     *             There is one exception, if var is &null;,
     *             0 will be returned.
     *             </p>
     *             <p>
     *             Caution: count may return 0 for a variable that isn't set,
     *             but it may also return 0 for a variable that has been initialized with an
     *             empty array. Use isset to test if a variable is set.
     *             </p>
     * @psalm-mutation-free
     */
    public function count(int $mode = \COUNT_NORMAL): int
    {
        if ($mode !== \COUNT_NORMAL && $mode !== \COUNT_RECURSIVE) {
            throw new \ValueError('count(): Argument #2 ($mode) must be either COUNT_NORMAL or COUNT_RECURSIVE');
        }

        if (
            $this->generator
            &&
            $mode === \COUNT_NORMAL
        ) {
            return \iterator_count($this->generator);
        }

        return \count($this->toArray(), $mode);
    }

    /**
     * Exchange the array for another one.
     *
     * @param array|mixed|static $data
     *
     * 1. use the current array, if it's a array
     * 2. fallback to empty array, if there is nothing
     * 3. call "getArray()" on object, if there is a "Arrayy"-object
     * 4. call "createFromObject()" on object, if there is a "\Traversable"-object
     * 5. call "__toArray()" on object, if the method exists
     * 6. cast a string or object with "__toString()" into an array
     * 7. throw a "InvalidArgumentException"-Exception
     *
     * @return array
     *
     * @phpstan-param  T|array<TKey,T>|self<TKey,T,TData> $data
     * @phpstan-return array<TKey,T>
     */
    public function exchangeArray($data): array
    {
        /** @phpstan-var array<TKey,T> array */
        $array = $this->fallbackForArray($data);

        $this->array = $array;
        $this->generator = null;

        return $this->array;
    }

    /**
     * Creates a copy of the ArrayyObject.
     *
     * @return array
     *
     * @phpstan-return array<int|string|TKey,T>
     */
    public function getArrayCopy(): array
    {
        $this->generatorToArray();

        return $this->array;
    }

    /**
     * Returns a new iterator, thus implementing the \Iterator interface.
     *
     * EXAMPLE: <code>
     * a(['foo', 'bar'])->getIterator(); // ArrayyIterator['foo', 'bar']
     * </code>
     *
     * @return \Iterator<mixed, mixed>
     *                          <p>An iterator for the values in the array.</p>
     * @phpstan-return \Iterator<TKey, T>
     */
    public function getIterator(): \Iterator
    {
        if ($this->generator instanceof ArrayyRewindableGenerator) {
            $generator = clone $this->generator;

            /** @phpstan-var \Arrayy\ArrayyRewindableGenerator<TKey,T> */
            $generatorTmp = new ArrayyRewindableExtendedGenerator(
                static function () use ($generator): \Generator {
                    yield from $generator;
                },
                null,
                static::class
            );

            $this->generator = $generatorTmp;

            return $this->generator;
        }

        $iterator = $this->getIteratorClass();

        if ($iterator === ArrayyIterator::class) {
            return new $iterator($this->toArray(), 0, static::class);
        }

        $return = new $iterator($this->toArray());
        \assert($return instanceof \Iterator);

        return $return;
    }

    /**
     * Gets the iterator classname for the ArrayObject.
     *
     * @return string
     *
     * @phpstan-return class-string
     */
    public function getIteratorClass(): string
    {
        return $this->iteratorClass;
    }

    /**
     * Sort the entries by key.
     *
     * @param int $sort_flags [optional] <p>
     *                        You may modify the behavior of the sort using the optional
     *                        parameter sort_flags, for details
     *                        see sort.
     *                        </p>
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     */
    #[\ReturnTypeWillChange]
    public function ksort(int $sort_flags = 0): self
    {
        $this->generatorToArray();

        \ksort($this->array, $sort_flags);

        return $this;
    }

    /**
     * Sort the entries by key.
     *
     * @param int $sort_flags [optional] <p>
     *                        You may modify the behavior of the sort using the optional
     *                        parameter sort_flags, for details
     *                        see sort.
     *                        </p>
     *
     * @return $this
     *               <p>(Immutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     */
    public function ksortImmutable(int $sort_flags = 0): self
    {
        $that = clone $this;

        /**
         * @psalm-suppress ImpureMethodCall - object is already cloned
         */
        $that->ksort($sort_flags);

        return $that;
    }

    /**
     * Sort an array using a case insensitive "natural order" algorithm.
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     */
    #[\ReturnTypeWillChange]
    public function natcasesort(): self
    {
        $this->generatorToArray();

        \natcasesort($this->array);

        return $this;
    }

    /**
     * Sort an array using a case insensitive "natural order" algorithm.
     *
     * @return $this
     *               <p>(Immutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function natcasesortImmutable(): self
    {
        $that = clone $this;

        /**
         * @psalm-suppress ImpureMethodCall - object is already cloned
         */
        $that->natcasesort();

        return $that;
    }

    /**
     * Sort entries using a "natural order" algorithm.
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     */
    #[\ReturnTypeWillChange]
    public function natsort(): self
    {
        $this->generatorToArray();

        \natsort($this->array);

        return $this;
    }

    /**
     * Sort entries using a "natural order" algorithm.
     *
     * @return $this
     *               <p>(Immutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function natsortImmutable(): self
    {
        $that = clone $this;

        /**
         * @psalm-suppress ImpureMethodCall - object is already cloned
         */
        $that->natsort();

        return $that;
    }

    /**
     * Whether or not an offset exists.
     *
     * @param bool|int|string $offset
     *
     * @return bool
     *
     * @psalm-mutation-free
     */
    #[\ReturnTypeWillChange]
    public function offsetExists($offset): bool
    {
        // php cast "bool"-index into "int"-index
        if ((bool) $offset === $offset) {
            $offset = (int) $offset;
        }
        \assert(\is_int($offset) || \is_string($offset));

        $offsetExists = $this->keyExists($offset);
        if ($offsetExists === true) {
            return true;
        }

        /**
         * https://github.com/vimeo/psalm/issues/2536
         *
         * @psalm-suppress PossiblyInvalidArgument
         * @psalm-suppress InvalidScalarArgument
         */
        if (
            $this->pathSeparator
            &&
            (string) $offset === $offset
            &&
            \strpos($offset, $this->pathSeparator) !== false
        ) {
            $explodedPath = \explode($this->pathSeparator, (string) $offset);
            /** @var string $lastOffset - helper for phpstan */
            $lastOffset = \array_pop($explodedPath);
            $containerPath = \implode($this->pathSeparator, $explodedPath);

            /**
             * @psalm-suppress MissingClosureReturnType
             * @psalm-suppress MissingClosureParamType
             */
            $this->callAtPath(
                $containerPath,
                static function ($container) use ($lastOffset, &$offsetExists) {
                    $offsetExists = \is_array($container) && \array_key_exists($lastOffset, $container);
                }
            );
        }

        return $offsetExists;
    }

    /**
     * Returns the value at specified offset.
     *
     * @param int|string $offset
     *
     * @return mixed
     *               <p>Will return null if the offset did not exists.</p>
     *
     * @template TOffset of key-of<TData>
     * @phpstan-param TOffset $offset
     * @phpstan-return TData[TOffset]|null
     */
    #[\ReturnTypeWillChange]
    public function &offsetGet($offset)
    {
        // init
        $value = null;

        if ($this->offsetExists($offset)) {
            /* @phpstan-ignore-next-line argument.templateType, argument.type */
            $value = &$this->__get($offset);
        }

        /* @phpstan-ignore-next-line return.type */
        return $value;
    }

    /**
     * Assigns a value to the specified offset + check the type.
     *
     * @param int|string|null $offset
     * @param mixed           $value
     *
     * @return void
     */
    #[\ReturnTypeWillChange]
    public function offsetSet($offset, $value)
    {
        $this->generatorToArray();

        if ($offset === null) {
            if ($this->properties !== []) {
                $this->checkType(null, $value);
            }

            $this->array[] = $value;
        } else {
            $this->internalSet(
                $offset,
                $value,
                true
            );
        }
    }

    /**
     * Unset an offset.
     *
     * @param int|string $offset
     *
     * @return void
     *              <p>(Mutable) Return nothing.</p>
     */
    #[\ReturnTypeWillChange]
    public function offsetUnset($offset)
    {
        $this->generatorToArray();

        if ($this->array === []) {
            return;
        }

        if ($this->keyExists($offset)) {
            unset($this->array[$offset]);

            return;
        }

        /**
         * https://github.com/vimeo/psalm/issues/2536
         *
         * @psalm-suppress PossiblyInvalidArgument
         * @psalm-suppress InvalidScalarArgument
         */
        if (
            $this->pathSeparator
            &&
            (string) $offset === $offset
            &&
            \strpos($offset, $this->pathSeparator) !== false
        ) {
            $path = \explode($this->pathSeparator, (string) $offset);
            $pathToUnset = \array_pop($path);

            /**
             * @psalm-suppress MissingClosureReturnType
             * @psalm-suppress MissingClosureParamType
             */
            $this->callAtPath(
                \implode($this->pathSeparator, $path),
                static function (&$offset) use ($pathToUnset) {
                    if (\is_array($offset)) {
                        unset($offset[$pathToUnset]);
                    } else {
                        $offset = null;
                    }
                }
            );
        }

        unset($this->array[$offset]);
    }

    /**
     * Serialize the current "Arrayy"-object.
     *
     * EXAMPLE: <code>
     * a([1, 4, 7])->serialize();
     * </code>
     *
     * @return string
     */
    public function serialize(): string
    {
        $this->generatorToArray();

        return \serialize($this);
    }

    /**
     * Sets the iterator classname for the current "Arrayy"-object.
     *
     * @param string $iteratorClass
     *
     * @throws \InvalidArgumentException
     *
     * @return void
     *
     * @phpstan-param class-string<\Arrayy\ArrayyIterator<TKey,T>> $iteratorClass
     */
    #[\ReturnTypeWillChange]
    public function setIteratorClass($iteratorClass)
    {
        if (\class_exists($iteratorClass)) {
            $this->iteratorClass = $iteratorClass;

            return;
        }

        if (\strpos($iteratorClass, '\\') === 0) {
            /** @var class-string<\Arrayy\ArrayyIterator<TKey,T>> $iteratorClass */
            $iteratorClass = '\\' . $iteratorClass;
            if (\class_exists($iteratorClass)) {
                /**
                 * @psalm-suppress PropertyTypeCoercion
                 */
                $this->iteratorClass = $iteratorClass;

                return;
            }
        }

        throw new \InvalidArgumentException('The iterator class does not exist: ' . $iteratorClass);
    }

    /**
     * Sort the entries with a user-defined comparison function and maintain key association.
     *
     * @param callable $callable
     *
     *@throws \InvalidArgumentException
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-param  callable(T,T):int $callable
     * @phpstan-return static
     */
    #[\ReturnTypeWillChange]
    public function uasort($callable): self
    {
        $this->generatorToArray();

        \uasort($this->array, $callable);

        return $this;
    }

    /**
     * Sort the entries with a user-defined comparison function and maintain key association.
     *
     * @param callable $callable
     *
     *@throws \InvalidArgumentException
     *
     * @return $this
     *               <p>(Immutable) Return this Arrayy object.</p>
     *
     * @phpstan-param  callable(T,T):int $callable
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function uasortImmutable($callable): self
    {
        $that = clone $this;

        /**
         * @psalm-suppress ImpureMethodCall - object is already cloned
         */
        $that->uasort($callable);

        return $that;
    }

    /**
     * Sort the entries by keys using a user-defined comparison function.
     *
     * @param callable $callable
     *
     * @throws \InvalidArgumentException
     *
     * @return static
     *                <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-param  callable(TKey,TKey):int $callable
     * @phpstan-return static
     */
    #[\ReturnTypeWillChange]
    public function uksort($callable): self
    {
        return $this->customSortKeys($callable);
    }

    /**
     * Sort the entries by keys using a user-defined comparison function.
     *
     * @param callable $callable
     *
     * @throws \InvalidArgumentException
     *
     * @return static
     *                <p>(Immutable) Return this Arrayy object.</p>
     *
     * @phpstan-param  callable(TKey,TKey):int $callable
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function uksortImmutable($callable): self
    {
        return $this->customSortKeysImmutable($callable);
    }

    /**
     * Unserialize an string and return the instance of the "Arrayy"-class.
     *
     * EXAMPLE: <code>
     * $serialized = a([1, 4, 7])->serialize();
     * a()->unserialize($serialized);
     * </code>
     *
     * @param string $string
     *
     * @return $this
     *
     * @phpstan-return static
     */
    #[\ReturnTypeWillChange]
    public function unserialize($string): self
    {
        return \unserialize($string, ['allowed_classes' => [__CLASS__, TypeCheckPhpDoc::class]]);
    }

    /**
     * Append a (key) + values to the current array.
     *
     * EXAMPLE: <code>
     * a(['fòô' => ['bàř']])->appendArrayValues(['foo1', 'foo2'], 'fòô'); // Arrayy['fòô' => ['bàř', 'foo1', 'foo2']]
     * </code>
     *
     * @param array $values
     * @param mixed $key
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object, with the appended values.</p>
     *
     * @phpstan-param  array<T> $values
     * @phpstan-param  TKey|null $key
     * @phpstan-return static
     */
    public function appendArrayValues(array $values, $key = null)
    {
        $this->generatorToArray();

        if ($key !== null) {
            if (
                isset($this->array[$key])
                &&
                \is_array($this->array[$key])
            ) {
                foreach ($values as $value) {
                    /* @phpstan-ignore-next-line assign.propertyType */
                    $this->array[$key][] = $value;
                }
            } else {
                foreach ($values as $value) {
                    $this->array[$key] = $value;
                }
            }
        } else {
            foreach ($values as $value) {
                $this->array[] = $value;
            }
        }

        return $this;
    }

    /**
     * Add a suffix to each key.
     *
     * @param int|string $prefix
     *
     * @return static
     *                <p>(Immutable) Return an Arrayy object, with the prefixed keys.</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function appendToEachKey($prefix): self
    {
        // init
        $result = [];

        foreach ($this->getGenerator() as $key => $item) {
            if ($item instanceof self) {
                $result[$prefix . $key] = $item->appendToEachKey($prefix);
            } elseif (\is_array($item)) {
                /* @phpstan-ignore-next-line argument.type */
                $result[$prefix . $key] = self::create($item, $this->iteratorClass, false)
                    ->appendToEachKey($prefix)
                    ->toArray();
            } else {
                $result[$prefix . $key] = $item;
            }
        }

        return self::create(
            /* @phpstan-ignore-next-line argument.type */
            $result,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Add a prefix to each value.
     *
     * @param float|int|string $prefix
     *
     * @return static
     *                <p>(Immutable) Return an Arrayy object, with the prefixed values.</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function appendToEachValue($prefix): self
    {
        // init
        $result = [];

        foreach ($this->getGenerator() as $key => $item) {
            if ($item instanceof self) {
                $result[$key] = $item->appendToEachValue($prefix);
            } elseif (\is_array($item)) {
                /* @phpstan-ignore-next-line argument.type */
                $result[$key] = self::create($item, $this->iteratorClass, false)->appendToEachValue($prefix)->toArray();
            } elseif (\is_object($item) === true) {
                $result[$key] = $item;
            } else {
                $result[$key] = $prefix . $item;
            }
        }

        /* @phpstan-ignore-next-line argument.type */
        return self::create($result, $this->iteratorClass, false);
    }

    /**
     * Sort an array in reverse order and maintain index association.
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     */
    public function arsort(): self
    {
        $this->generatorToArray();

        \arsort($this->array);

        return $this;
    }

    /**
     * Sort an array in reverse order and maintain index association.
     *
     * @return $this
     *               <p>(Immutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function arsortImmutable(): self
    {
        $that = clone $this;

        $that->generatorToArray();

        \arsort($that->array);

        return $that;
    }

    /**
     * Iterate over the current array and execute a callback for each loop.
     *
     * EXAMPLE: <code>
     * $result = A::create();
     * $closure = function ($value, $key) use ($result) {
     *     $result[$key] = ':' . $value . ':';
     * };
     * a(['foo', 'bar' => 'bis'])->at($closure); // Arrayy[':foo:', 'bar' => ':bis:']
     * </code>
     *
     * @param \Closure $closure
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param \Closure(T,TKey):mixed $closure <p>INFO: \Closure result is not used, but void is not supported in PHP 7.0</p>
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function at(\Closure $closure): self
    {
        $that = clone $this;

        foreach ($that->getGenerator() as $key => $value) {
            $closure($value, $key);
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $that->toArray(),
            $this->iteratorClass,
            false
        );
    }

    /**
     * Returns the average value of the current array.
     *
     * EXAMPLE: <code>
     * a([-9, -8, -7, 1.32])->average(2); // -5.67
     * </code>
     *
     * @param int $decimals <p>The number of decimal-numbers to return.</p>
     *
     * @return float|int
     *                   <p>The average value.</p>
     * @psalm-mutation-free
     */
    public function average($decimals = 0)
    {
        $array = $this->toArray();
        $count = \count($array, \COUNT_NORMAL);

        if (!$count) {
            return 0;
        }

        if ((int) $decimals !== $decimals) {
            $decimals = 0;
        }

        $sum = 0;
        foreach ($array as $value) {
            if (
                \is_int($value)
                ||
                \is_float($value)
                ||
                \is_bool($value)
            ) {
                $sum += $value;
            } elseif (\is_string($value) && \is_numeric($value)) {
                $sum += (float) $value;
            }
        }

        return \round($sum / $count, $decimals);
    }

    /**
     * Changes all keys in an array.
     *
     * @param int $case [optional] <p> Either <strong>CASE_UPPER</strong><br />
     *                  or <strong>CASE_LOWER</strong> (default)</p>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function changeKeyCase(int $case = \CASE_LOWER): self
    {
        if (
            $case !== \CASE_LOWER
            &&
            $case !== \CASE_UPPER
        ) {
            $case = \CASE_LOWER;
        }

        $return = [];
        foreach ($this->getGenerator() as $key => $value) {
            if ($case === \CASE_LOWER) {
                $key = \mb_convert_case(
                    (string) $key,
                    \defined('MB_CASE_LOWER_SIMPLE') ? \MB_CASE_LOWER_SIMPLE : \MB_CASE_LOWER,
                    'UTF-8'
                );
            } else {
                $key = \mb_convert_case(
                    (string) $key,
                    \defined('MB_CASE_UPPER_SIMPLE') ? \MB_CASE_UPPER_SIMPLE : \MB_CASE_UPPER,
                    'UTF-8'
                );
            }

            $return[$key] = $value;
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $return,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Change the path separator of the array wrapper.
     *
     * By default, the separator is: "."
     *
     * @param non-empty-string $separator <p>Separator to set.</p>
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     */
    public function changeSeparator($separator): self
    {
        $this->pathSeparator = $separator;

        return $this;
    }

    /**
     * Create a chunked version of the current array.
     *
     * EXAMPLE: <code>
     * a([-9, -8, -7, 1.32])->chunk(2); // Arrayy[[-9, -8], [-7, 1.32]]
     * </code>
     *
     * @param int  $size         <p>Size of each chunk.</p>
     * @param bool $preserveKeys <p>Whether array keys are preserved or no.</p>
     *
     * @return static|static[]
     *                <p>(Immutable) A new array of chunks from the original array.</p>
     *
     * @phpstan-return self<int,self<array-key,T,array<array-key,T>>,array<int,self<array-key,T,array<array-key,T>>>>
     * @psalm-mutation-free
     */
    public function chunk($size, $preserveKeys = false): self
    {
        if ($preserveKeys) {
            $generator = function () use ($size) {
                $values = [];
                $tmpCounter = 0;
                foreach ($this->getGenerator() as $key => $value) {
                    ++$tmpCounter;

                    $values[$key] = $value;
                    if ($tmpCounter === $size) {
                        yield $values;

                        $values = [];
                        $tmpCounter = 0;
                    }
                }

                if ($values !== []) {
                    yield $values;
                }
            };
        } else {
            $generator = function () use ($size) {
                $values = [];
                $tmpCounter = 0;
                foreach ($this->getGenerator() as $value) {
                    ++$tmpCounter;

                    $values[] = $value;
                    if ($tmpCounter === $size) {
                        yield $values;

                        $values = [];
                        $tmpCounter = 0;
                    }
                }

                if ($values !== []) {
                    yield $values;
                }
            };
        }

        return static::create(
            $generator,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Clean all falsy values from the current array.
     *
     * EXAMPLE: <code>
     * a([-8 => -9, 1, 2 => false])->clean(); // Arrayy[-8 => -9, 1]
     * </code>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function clean(): self
    {
        return $this->filter(
            static function ($value) {
                return (bool) $value;
            }
        );
    }

    /**
     * WARNING!!! -> Clear the current full array or a $key of it.
     *
     * EXAMPLE: <code>
     * a([-8 => -9, 1, 2 => false])->clear(); // Arrayy[]
     * </code>
     *
     * @param int|int[]|string|string[]|null $key
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object, with an empty array.</p>
     *
     * @phpstan-return static
     */
    public function clear($key = null): self
    {
        if ($key !== null) {
            if (\is_array($key)) {
                foreach ($key as $keyTmp) {
                    $this->offsetUnset($keyTmp);
                }
            } else {
                $this->offsetUnset($key);
            }

            return $this;
        }

        $this->array = [];
        $this->generator = null;

        return $this;
    }

    /**
     * Check if an item is in the current array.
     *
     * EXAMPLE: <code>
     * a([1, true])->containsOnly(true); // false
     * </code>
     *
     * @param float|int|string $value
     * @param bool             $recursive
     * @param bool             $strict
     *
     * @return bool
     * @psalm-mutation-free
     */
    public function containsOnly($value, bool $recursive = false, bool $strict = true): bool
    {
        if ($recursive === true) {
            return $this->in_array_recursive($value, $this->toArray(), $strict);
        }

        /** @noinspection PhpParameterByRefIsNotUsedAsReferenceInspection */
        $tmpCount = 0;
        foreach ($this->getGeneratorByReference() as &$valueFromArray) {
            $tmpCount++;

            if ($strict) {
                if ($value !== $valueFromArray) {
                    return false;
                }
            } else {
                /** @noinspection NestedPositiveIfStatementsInspection */
                if ($value != $valueFromArray) {
                    return false;
                }
            }
        }

        return $tmpCount !== 0;
    }

    /**
     * Check if an item is in the current array.
     *
     * EXAMPLE: <code>
     * a([1, true])->contains(true); // true
     * </code>
     *
     * @param float|int|string $value
     * @param bool             $recursive
     * @param bool             $strict
     *
     * @return bool
     * @psalm-mutation-free
     */
    public function contains($value, bool $recursive = false, bool $strict = true): bool
    {
        if ($recursive === true) {
            return $this->in_array_recursive($value, $this->toArray(), $strict);
        }

        /** @noinspection PhpParameterByRefIsNotUsedAsReferenceInspection */
        foreach ($this->getGeneratorByReference() as &$valueFromArray) {
            if ($strict) {
                if ($value === $valueFromArray) {
                    return true;
                }
            } else {
                /** @noinspection NestedPositiveIfStatementsInspection */
                if ($value == $valueFromArray) {
                    return true;
                }
            }
        }

        return false;
    }

    /**
     * Check if an (case-insensitive) string is in the current array.
     *
     * EXAMPLE: <code>
     * a(['E', 'é'])->containsCaseInsensitive('É'); // true
     * </code>
     *
     * @param mixed $value
     * @param bool  $recursive
     *
     * @return bool
     * @psalm-mutation-free
     *
     * @psalm-suppress InvalidCast - hack for int|float|bool support
     */
    public function containsCaseInsensitive($value, $recursive = false): bool
    {
        if ($value === null) {
            return false;
        }

        if ($recursive === true) {
            /** @noinspection PhpParameterByRefIsNotUsedAsReferenceInspection */
            foreach ($this->getGeneratorByReference() as &$valueTmp) {
                if (\is_array($valueTmp)) {
                    $return = (new self($valueTmp))->containsCaseInsensitive($value, $recursive);
                    if ($return === true) {
                        return $return;
                    }
                } elseif (\mb_strtoupper((string) $valueTmp) === \mb_strtoupper((string) $value)) {
                    return true;
                }
            }

            return false;
        }

        /** @noinspection PhpParameterByRefIsNotUsedAsReferenceInspection */
        foreach ($this->getGeneratorByReference() as &$valueTmp) {
            if (\mb_strtoupper((string) $valueTmp) === \mb_strtoupper((string) $value)) {
                return true;
            }
        }

        return false;
    }

    /**
     * Check if the given key/index exists in the array.
     *
     * EXAMPLE: <code>
     * a([1 => true])->containsKey(1); // true
     * </code>
     *
     * @param int|string $key <p>key/index to search for</p>
     *
     * @return bool
     *              <p>Returns true if the given key/index exists in the array, false otherwise.</p>
     *
     * @psalm-mutation-free
     */
    public function containsKey($key): bool
    {
        return $this->offsetExists($key);
    }

    /**
     * Check if all given needles are present in the array as key/index.
     *
     * EXAMPLE: <code>
     * a([1 => true])->containsKeys(array(1 => 0)); // true
     * </code>
     *
     * @param array $needles   <p>The keys you are searching for.</p>
     * @param bool  $recursive
     *
     * @return bool
     *              <p>Returns true if all the given keys/indexes exists in the array, false otherwise.</p>
     *
     * @phpstan-param array<TKey> $needles
     * @psalm-mutation-free
     */
    public function containsKeys(array $needles, bool $recursive = false): bool
    {
        if ($recursive === true) {
            return
                \count(
                    \array_intersect(
                        $needles,
                        $this->keys(true)->toArray()
                    ),
                    \COUNT_RECURSIVE
                )
                ===
                \count(
                    $needles,
                    \COUNT_RECURSIVE
                );
        }

        return \count(
            \array_intersect($needles, $this->keys()->toArray()),
            \COUNT_NORMAL
        )
                ===
                \count(
                    $needles,
                    \COUNT_NORMAL
                );
    }

    /**
     * Check if all given needles are present in the array as key/index.
     *
     * @param array $needles <p>The keys you are searching for.</p>
     *
     * @return bool
     *              <p>Returns true if all the given keys/indexes exists in the array, false otherwise.</p>
     *
     * @phpstan-param array<TKey> $needles
     * @psalm-mutation-free
     */
    public function containsKeysRecursive(array $needles): bool
    {
        return $this->containsKeys($needles, true);
    }

    /**
     * alias: for "Arrayy->contains()"
     *
     * @param float|int|string $value
     *
     * @return bool
     *
     * @see Arrayy::contains()
     * @psalm-mutation-free
     */
    public function containsValue($value): bool
    {
        return $this->contains($value);
    }

    /**
     * alias: for "Arrayy->contains($value, true)"
     *
     * @param float|int|string $value
     *
     * @return bool
     *
     * @see Arrayy::contains()
     * @psalm-mutation-free
     */
    public function containsValueRecursive($value): bool
    {
        return $this->contains($value, true);
    }

    /**
     * Check if all given needles are present in the array.
     *
     * EXAMPLE: <code>
     * a([1, true])->containsValues(array(1, true)); // true
     * </code>
     *
     * @param array $needles
     *
     * @return bool
     *              <p>Returns true if all the given values exists in the array, false otherwise.</p>
     *
     * @phpstan-param array<T> $needles
     * @psalm-mutation-free
     */
    public function containsValues(array $needles): bool
    {
        return \count(
            \array_intersect(
                $needles,
                $this->toArray()
            ),
            \COUNT_NORMAL
        )
               ===
               \count(
                   $needles,
                   \COUNT_NORMAL
               );
    }

    /**
     * Counts all the values of an array
     *
     * @see          http://php.net/manual/en/function.array-count-values.php
     *
     * @return static
     *                <p>
     *                (Immutable)
     *                An associative Arrayy-object of values from input as
     *                keys and their count as value.
     *                </p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function countValues(): self
    {
        /** @phpstan-var static $return - help for phpstan */
        /* @phpstan-ignore-next-line argument.type */
        $return = self::create(\array_count_values($this->toArray()), $this->iteratorClass);

        return $return;
    }

    /**
     * Creates an Arrayy object.
     *
     * @param mixed  $data
     * @param string $iteratorClass
     * @param bool   $checkPropertiesInConstructor
     *
     * @return static
     *                <p>(Immutable) Returns an new instance of the Arrayy object.</p>
     *
     * @phpstan-param  TData|self<TKey,T,TData>|\Traversable<TKey,T>|callable|object|scalar|null $data
     * @phpstan-param  class-string<\Arrayy\ArrayyIterator<TKey,T>> $iteratorClass
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public static function create(
        $data = [],
        string $iteratorClass = ArrayyIterator::class,
        bool $checkPropertiesInConstructor = true
    ) {
        /** @var static $instance */
        $instance = new static( // @phpstan-ignore new.static
            $data,
            $iteratorClass,
            $checkPropertiesInConstructor
        );

        return $instance;
    }

    /**
     * Flatten an array with the given character as a key delimiter.
     *
     * EXAMPLE: <code>
     * $dot = a(['foo' => ['abc' => 'xyz', 'bar' => ['baz']]]);
     * $flatten = $dot->flatten();
     * $flatten['foo.abc']; // 'xyz'
     * $flatten['foo.bar.0']; // 'baz'
     * </code>
     *
     * @param string     $delimiter
     * @param string     $prepend
     * @param array|null $items
     *
     * @return array
     *
     * @phpstan-param array<array-key, mixed>|null $items
     * @phpstan-return array<array-key, mixed>
     */
    public function flatten($delimiter = '.', $prepend = '', $items = null)
    {
        // init
        $flatten = [];

        if ($items === null) {
            $items = $this->getArray();
        }

        foreach ($items as $key => $value) {
            if (\is_array($value) && $value !== []) {
                $flatten[] = $this->flatten($delimiter, $prepend . $key . $delimiter, $value);
            } else {
                $flatten[] = [$prepend . $key => $value];
            }
        }

        if (\count($flatten) === 0) {
            return [];
        }

        return \array_merge_recursive([], ...$flatten);
    }

    /**
     * WARNING: Creates an Arrayy object by reference.
     *
     * @param array $array
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-param  array<TKey,T> $array
     * @phpstan-return $this
     *
     * @internal this will not check any types because it's set directly as reference
     */
    public function createByReference(array &$array = []): self
    {
        $this->array = &$array;
        $this->generator = null;

        return $this;
    }

    /**
     * Create an new instance from a callable function which will return an Generator.
     *
     * @param callable $generatorFunction
     *
     * @return static
     *                <p>(Immutable) Returns an new instance of the Arrayy object.</p>
     *
     * @phpstan-param callable():\Generator<TKey,T> $generatorFunction
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public static function createFromGeneratorFunction(callable $generatorFunction): self
    {
        return self::create($generatorFunction);
    }

    /**
     * Create an new instance filled with a copy of values from a "Generator"-object.
     *
     * @param \Generator $generator
     *
     * @return static
     *                <p>(Immutable) Returns an new instance of the Arrayy object.</p>
     *
     * @phpstan-param \Generator<TKey,T> $generator
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public static function createFromGeneratorImmutable(\Generator $generator): self
    {
        /* @phpstan-ignore-next-line argument.type */
        return self::create(\iterator_to_array($generator, true));
    }

    /**
     * Create an new Arrayy object via JSON.
     *
     * @param string $json
     *
     * @return static
     *                <p>(Immutable) Returns an new instance of the Arrayy object.</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public static function createFromJson(string $json): self
    {
        return static::create(\json_decode($json, true));
    }

    /**
     * Create an new Arrayy object via JSON.
     *
     * @param array $array
     *
     * @return static
     *                <p>(Immutable) Returns an new instance of the Arrayy object.</p>
     *
     * @phpstan-param array<TKey,T> $array
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public static function createFromArray(array $array): self
    {
        /* @phpstan-ignore-next-line argument.type */
        return static::create($array);
    }

    /**
     * Create an new instance filled with values from an object that is iterable.
     *
     * @param \Traversable $object <p>iterable object</p>
     *
     * @return static
     *                <p>(Immutable) Returns an new instance of the Arrayy object.</p>
     *
     * @phpstan-param \Traversable<array-key,T> $object
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public static function createFromObject(\Traversable $object): self
    {
        // init
        $arrayy = static::create();

        if ($object instanceof self) {
            $objectArray = $object->getGenerator();
        } else {
            $objectArray = $object;
        }

        foreach ($objectArray as $key => $value) {
            /**
             * @psalm-suppress ImpureMethodCall - object is already re-created
             */
            $arrayy->internalSet($key, $value);
        }

        return $arrayy;
    }

    /**
     * Create an new instance filled with values from an object.
     *
     * @param object $object
     *
     * @return static
     *                <p>(Immutable) Returns an new instance of the Arrayy object.</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public static function createFromObjectVars($object): self
    {
        return self::create(self::objectToArray($object));
    }

    /**
     * Create an new Arrayy object via string.
     *
     * @param string                $str       <p>The input string.</p>
     * @param non-empty-string|null $delimiter <p>The boundary string.</p>
     * @param string|null           $regEx     <p>Use the $delimiter or the $regEx, so if $pattern is null, $delimiter will be
     *                                         used.</p>
     *
     * @return static
     *                <p>(Immutable) Returns an new instance of the Arrayy object.</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public static function createFromString(string $str, ?string $delimiter = null, ?string $regEx = null): self
    {
        if ($regEx) {
            \preg_match_all($regEx, $str, $array);

            if (!empty($array)) {
                $array = $array[0];
            }
        } else {
            /** @noinspection NestedPositiveIfStatementsInspection */
            if ($delimiter !== null) {
                $array = \explode($delimiter, $str);
            } else {
                $array = [$str];
            }
        }

        // trim all string in the array
        /**
         * @psalm-suppress MissingClosureParamType
         */
        \array_walk(
            $array,
            static function (&$val) {
                if ((string) $val === $val) {
                    $val = \trim($val);
                }
            }
        );

        /** @var static $return - help for phpstan */
        /* @phpstan-ignore-next-line argument.type */
        $return = static::create($array);

        return $return;
    }

    /**
     * Create an new instance filled with a copy of values from a "Traversable"-object.
     *
     * @param \Traversable $traversable
     * @param bool         $use_keys    [optional] <p>
     *                                  Whether to use the iterator element keys as index.
     *                                  </p>
     *
     * @return static
     *                <p>(Immutable) Returns an new instance of the Arrayy object.</p>
     *
     * @phpstan-param \Traversable<array-key|TKey,T> $traversable
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public static function createFromTraversableImmutable(\Traversable $traversable, bool $use_keys = true): self
    {
        /* @phpstan-ignore-next-line argument.type */
        return self::create(\iterator_to_array($traversable, $use_keys));
    }

    /**
     * Create an new instance containing a range of elements.
     *
     * @param float|int|string $low  <p>First value of the sequence.</p>
     * @param float|int|string $high <p>The sequence is ended upon reaching the end value.</p>
     * @param float|int        $step <p>Used as the increment between elements in the sequence.</p>
     *
     * @return static
     *                <p>(Immutable) Returns an new instance of the Arrayy object.</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public static function createWithRange($low, $high, $step = 1): self
    {
        /** @phpstan-var static $return - help for phpstan */
        /* @phpstan-ignore-next-line argument.type */
        $return = static::create(\range($low, $high, $step));

        return $return;
    }

    /**
     * Gets the element of the array at the current internal iterator position.
     *
     * @return false|mixed
     *
     * @phpstan-return false|T
     */
    public function current()
    {
        if ($this->generator) {
            return $this->generator->current();
        }

        return \current($this->array);
    }

    /**
     * Custom sort by index via "uksort".
     *
     * EXAMPLE: <code>
     * $callable = function ($a, $b) {
     *     if ($a == $b) {
     *         return 0;
     *     }
     *     return ($a > $b) ? 1 : -1;
     * };
     * $arrayy = a(['three' => 3, 'one' => 1, 'two' => 2]);
     * $resultArrayy = $arrayy->customSortKeys($callable); // Arrayy['one' => 1, 'three' => 3, 'two' => 2]
     * </code>
     *
     * @see          http://php.net/manual/en/function.uksort.php
     *
     * @param callable $callable
     *
     * @throws \InvalidArgumentException
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-param  callable(TKey,TKey):int $callable
     * @phpstan-return static
     */
    public function customSortKeys(callable $callable): self
    {
        $this->generatorToArray();

        \uksort($this->array, $callable);

        return $this;
    }

    /**
     * Custom sort by index via "uksort".
     *
     * @see          http://php.net/manual/en/function.uksort.php
     *
     * @param callable $callable
     *
     * @throws \InvalidArgumentException
     *
     * @return $this
     *               <p>(Immutable) Return this Arrayy object.</p>
     *
     * @phpstan-param  callable(TKey,TKey):int $callable
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function customSortKeysImmutable(callable $callable): self
    {
        $that = clone $this;

        $that->generatorToArray();

        /**
         * @psalm-suppress ImpureFunctionCall - object is already cloned
         */
        \uksort($that->array, $callable);

        return $that;
    }

    /**
     * Custom sort by value via "usort".
     *
     * EXAMPLE: <code>
     * $callable = function ($a, $b) {
     *     if ($a == $b) {
     *         return 0;
     *     }
     *     return ($a > $b) ? 1 : -1;
     * };
     * $arrayy = a(['three' => 3, 'one' => 1, 'two' => 2]);
     * $resultArrayy = $arrayy->customSortValues($callable); // Arrayy[1, 2, 3]
     * </code>
     *
     * @see          http://php.net/manual/en/function.usort.php
     *
     * @param callable $callable
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-param  callable(T,T):int $callable
     * @phpstan-return static
     */
    public function customSortValues(callable $callable): self
    {
        $this->generatorToArray();

        \usort($this->array, $callable);

        return $this;
    }

    /**
     * Custom sort by value via "usort".
     *
     * @see          http://php.net/manual/en/function.usort.php
     *
     * @param callable $callable
     *
     * @throws \InvalidArgumentException
     *
     * @return $this
     *               <p>(Immutable) Return this Arrayy object.</p>
     *
     * @phpstan-param  callable(T,T):int $callable
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function customSortValuesImmutable($callable): self
    {
        $that = clone $this;

        /**
         * @psalm-suppress ImpureMethodCall - object is already cloned
         */
        $that->customSortValues($callable);

        return $that;
    }

    /**
     * Delete the given key or keys.
     *
     * @param int|int[]|string|string[] $keyOrKeys
     *
     * @return void
     */
    public function delete($keyOrKeys)
    {
        $keyOrKeys = (array) $keyOrKeys;

        foreach ($keyOrKeys as $key) {
            $this->offsetUnset($key);
        }
    }

    /**
     * Return elements where the values that are only in the current array.
     *
     * EXAMPLE: <code>
     * a([1 => 1, 2 => 2])->diff([1 => 1]); // Arrayy[2 => 2]
     * </code>
     *
     * @param array ...$array
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param  array<TKey,T> ...$array
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function diff(array ...$array): self
    {
        if (\count($array) > 1) {
            $array = \array_merge([], ...$array);
        } else {
            $array = $array[0];
        }

        $generator = function () use ($array): \Generator {
            foreach ($this->getGenerator() as $key => $value) {
                if (\in_array($value, $array, true) === false) {
                    yield $key => $value;
                }
            }
        };

        return static::create(
            $generator,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Return elements where the keys are only in the current array.
     *
     * @param array ...$array
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param  array<TKey,T> ...$array
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function diffKey(array ...$array): self
    {
        if (\count($array) > 1) {
            $array = \array_replace([], ...$array);
        } else {
            $array = $array[0];
        }

        $generator = function () use ($array): \Generator {
            foreach ($this->getGenerator() as $key => $value) {
                if (\array_key_exists($key, $array) === false) {
                    yield $key => $value;
                }
            }
        };

        return static::create(
            $generator,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Return elements where the values and keys are only in the current array.
     *
     * @param array ...$array
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param  array<TKey,T> $array
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function diffKeyAndValue(array ...$array): self
    {
        if (\count($array) > 1) {
            $array = \array_merge([], ...$array);
        } else {
            $array = $array[0];
        }

        $generator = function () use ($array): \Generator {
            foreach ($this->getGenerator() as $key => $value) {
                $isset = isset($array[$key]);

                if (
                    !$isset
                    ||
                    $array[$key] !== $value
                ) {
                    yield $key => $value;
                }
            }
        };

        return static::create(
            $generator,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Return elements where the values are only in the current multi-dimensional array.
     *
     * EXAMPLE: <code>
     * a([1 => [1 => 1], 2 => [2 => 2]])->diffRecursive([1 => [1 => 1]]); // Arrayy[2 => [2 => 2]]
     * </code>
     *
     * @param array                 $array
     * @param array|\Generator|null $helperVariableForRecursion <p>(only for internal usage)</p>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param  array<TKey,T> $array
     * @phpstan-param  null|array<TKey,T>|\Generator<TKey,T> $helperVariableForRecursion
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function diffRecursive(array $array = [], $helperVariableForRecursion = null): self
    {
        // init
        $result = [];

        if (
            $helperVariableForRecursion !== null
            &&
            \is_array($helperVariableForRecursion)
        ) {
            $arrayForTheLoop = $helperVariableForRecursion;
        } else {
            $arrayForTheLoop = $this->getGenerator();
        }

        foreach ($arrayForTheLoop as $key => $value) {
            if ($value instanceof self) {
                $value = $value->toArray();
            }

            if (\array_key_exists($key, $array)) {
                if ($value !== $array[$key]) {
                    $result[$key] = $value;
                }
            } else {
                $result[$key] = $value;
            }
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $result,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Return elements where the values that are only in the new $array.
     *
     * EXAMPLE: <code>
     * a([1 => 1])->diffReverse([1 => 1, 2 => 2]); // Arrayy[2 => 2]
     * </code>
     *
     * @param array $array
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param  array<TKey,T> $array
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function diffReverse(array $array = []): self
    {
        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            \array_diff($array, $this->toArray()),
            $this->iteratorClass,
            false
        );
    }

    /**
     * Divide an array into two arrays. One with keys and the other with values.
     *
     * EXAMPLE: <code>
     * a(['a' => 1, 'b' => ''])->divide(); // Arrayy[Arrayy['a', 'b'], Arrayy[1, '']]
     * </code>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function divide(): self
    {
        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            [
                $this->keys(),
                $this->values(),
            ],
            $this->iteratorClass,
            false
        );
    }

    /**
     * Iterate over the current array and modify the array's value.
     *
     * EXAMPLE: <code>
     * $result = A::create();
     * $closure = function ($value) {
     *     return ':' . $value . ':';
     * };
     * a(['foo', 'bar' => 'bis'])->each($closure); // Arrayy[':foo:', 'bar' => ':bis:']
     * </code>
     *
     * @param \Closure $closure
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @template TEach
     *                 <p>The output value type.</p>
     *
     * @phpstan-param \Closure(T,?TKey):TEach $closure
     * @phpstan-return static<TKey,TEach,array<TKey,TEach>>
     * @psalm-mutation-free
     */
    public function each(\Closure $closure): self
    {
        // init
        $array = [];

        foreach ($this->getGenerator() as $key => $value) {
            $array[$key] = $closure($value, $key);
        }

        return static::create( // @phpstan-ignore return.type (create() is intentionally re-parameterized with TEach)
            /* @phpstan-ignore-next-line argument.type */
            $array,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Sets the internal iterator to the last element in the array and returns this element.
     *
     * @return false|mixed
     *
     * @phpstan-return T|false
     */
    public function end()
    {
        if ($this->generator) {
            $count = $this->count();
            if ($count === 0) {
                return false;
            }

            $counter = 0;
            /** @noinspection PhpUnusedLocalVariableInspection */
            foreach ($this->getIterator() as $item) {
                if (++$counter === $count - 1) {
                    break;
                }
            }
        }

        return \end($this->array);
    }

    /**
     * Check if a value is in the current array using a closure.
     *
     * EXAMPLE: <code>
     * $callable = function ($value, $key) {
     *     return 2 === $key and 'two' === $value;
     * };
     * a(['foo', 2 => 'two'])->exists($callable); // true
     * </code>
     *
     * @param \Closure $closure
     *
     * @return bool
     *              <p>Returns true if the given value is found, false otherwise.</p>
     *
     * @phpstan-param \Closure(T,TKey):bool $closure
     */
    public function exists(\Closure $closure): bool
    {
        // init
        $isExists = false;

        foreach ($this->getGenerator() as $key => $value) {
            if ($closure($value, $key)) {
                $isExists = true;

                break;
            }
        }

        return $isExists;
    }

    /**
     * Fill the array until "$num" with "$default" values.
     *
     * EXAMPLE: <code>
     * a(['bar'])->fillWithDefaults(3, 'foo'); // Arrayy['bar', 'foo', 'foo']
     * </code>
     *
     * @param int   $num
     * @param mixed $default
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param T $default
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function fillWithDefaults(int $num, $default = null): self
    {
        if ($num < 0) {
            throw new \InvalidArgumentException('The $num parameter can only contain non-negative values.');
        }

        $this->generatorToArray();

        $tmpArray = $this->array;

        $count = \count($tmpArray);

        while ($count < $num) {
            $tmpArray[] = $default;
            ++$count;
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $tmpArray,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Find all items in an array that pass the truth test.
     *
     * EXAMPLE: <code>
     * $closure = function ($value) {
     *     return $value % 2 !== 0;
     * }
     * a([1, 2, 3, 4])->filter($closure); // Arrayy[0 => 1, 2 => 3]
     * </code>
     *
     * @param \Closure|null $closure [optional] <p>
     *                               The callback function to use
     *                               </p>
     *                               <p>
     *                               If no callback is supplied, all entries of
     *                               input equal to false (see
     *                               converting to
     *                               boolean) will be removed.
     *                               </p>
     * @param int           $flag    [optional] <p>
     *                               Flag determining what arguments are sent to <i>callback</i>:
     *                               </p>
     *                               <ul>
     *                               <li>
     *                               <b>ARRAY_FILTER_USE_KEY</b> (1) - pass key as the only argument
     *                               to <i>callback</i> instead of the value
     *                               </li>
     *                               <li>
     *                               <b>ARRAY_FILTER_USE_BOTH</b> (2) - pass both value and key as
     *                               arguments to <i>callback</i> instead of the value
     *                               </li>
     *                               </ul>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param null|(\Closure(T,TKey=):bool)|(\Closure(T):bool)|(\Closure(TKey):bool) $closure
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function filter($closure = null, int $flag = \ARRAY_FILTER_USE_BOTH)
    {
        if (!$closure) {
            return $this->clean();
        }

        if ($flag === \ARRAY_FILTER_USE_KEY) {
            $generator = function () use ($closure) {
                foreach ($this->getGenerator() as $key => $value) {
                    if ($closure($key) === true) {
                        yield $key => $value;
                    }
                }
            };
        } elseif ($flag === \ARRAY_FILTER_USE_BOTH) {
            /** @noinspection PhpSillyAssignmentInspection - hack for phpstan - https://github.com/phpstan/phpstan/issues/4192 */
            /** @phpstan-var \Closure(T,TKey):bool $closure */
            $closure = $closure;

            $generator = function () use ($closure) {
                foreach ($this->getGenerator() as $key => $value) {
                    if ($closure($value, $key) === true) {
                        yield $key => $value;
                    }
                }
            };
        } else {
            $generator = function () use ($closure) {
                foreach ($this->getGenerator() as $key => $value) {
                    if ($closure($value) === true) {
                        yield $key => $value;
                    }
                }
            };
        }

        return static::create(
            $generator,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Filters an array of objects (or a numeric array of associative arrays) based on the value of a particular
     * property within that.
     *
     * @param string      $property
     * @param mixed       $value
     * @param string|null $comparisonOp
     *                                  <p>
     *                                  'eq' (equals),<br />
     *                                  'gt' (greater),<br />
     *                                  'gte' || 'ge' (greater or equals),<br />
     *                                  'lt' (less),<br />
     *                                  'lte' || 'le' (less or equals),<br />
     *                                  'ne' (not equals),<br />
     *                                  'contains',<br />
     *                                  'notContains',<br />
     *                                  'newer' (via strtotime),<br />
     *                                  'older' (via strtotime),<br />
     *                                  </p>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param array<array-key, mixed>|T $value
     * @phpstan-return static
     * @psalm-mutation-free
     *
     * @psalm-suppress MissingClosureReturnType
     * @psalm-suppress MissingClosureParamType
     */
    public function filterBy(
        string $property,
        $value,
        ?string $comparisonOp = null
    ): self {
        if (!$comparisonOp) {
            $comparisonOp = \is_array($value) ? 'contains' : 'eq';
        }

        $ops = [
            'eq' => static function ($item, $prop, $value): bool {
                return $item[$prop] === $value;
            },
            'gt' => static function ($item, $prop, $value): bool {
                return $item[$prop] > $value;
            },
            'ge' => static function ($item, $prop, $value): bool {
                return $item[$prop] >= $value;
            },
            'gte' => static function ($item, $prop, $value): bool {
                return $item[$prop] >= $value;
            },
            'lt' => static function ($item, $prop, $value): bool {
                return $item[$prop] < $value;
            },
            'le' => static function ($item, $prop, $value): bool {
                return $item[$prop] <= $value;
            },
            'lte' => static function ($item, $prop, $value): bool {
                return $item[$prop] <= $value;
            },
            'ne' => static function ($item, $prop, $value): bool {
                return $item[$prop] !== $value;
            },
            'contains' => static function ($item, $prop, $value): bool {
                return \in_array($item[$prop], (array) $value, true);
            },
            'notContains' => static function ($item, $prop, $value): bool {
                return !\in_array($item[$prop], (array) $value, true);
            },
            'newer' => static function ($item, $prop, $value): bool {
                return \strtotime($item[$prop]) > \strtotime($value);
            },
            'older' => static function ($item, $prop, $value): bool {
                return \strtotime($item[$prop]) < \strtotime($value);
            },
        ];

        $result = \array_values(
            \array_filter(
                $this->toArray(false, true),
                static function ($item) use (
                    $property,
                    $value,
                    $ops,
                    $comparisonOp
                ) {
                    $item = (array) $item;
                    /* @phpstan-ignore-next-line argument.type */
                    $itemArrayy = static::create($item);
                    $item[$property] = $itemArrayy->get($property, []);

                    return $ops[$comparisonOp]($item, $property, $value);
                }
            )
        );

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $result,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Find the first item in an array that passes the truth test, otherwise return false.
     *
     * EXAMPLE: <code>
     * $search = 'foo';
     * $closure = function ($value, $key) use ($search) {
     *     return $value === $search;
     * };
     * a(['foo', 'bar', 'lall'])->find($closure); // 'foo'
     * </code>
     *
     * @param \Closure $closure
     *
     * @return false|mixed
     *                     <p>Return false if we did not find the value.</p>
     *
     * @phpstan-param \Closure(T,TKey):bool $closure
     * @phpstan-return T|false
     */
    public function find(\Closure $closure)
    {
        foreach ($this->getGenerator() as $key => $value) {
            if ($closure($value, $key)) {
                return $value;
            }
        }

        return false;
    }

    /**
     * Find the key of the first item in an array that passes the truth test, otherwise return false.
     *
     * EXAMPLE: <code>
     * $search = 'foo';
     * $closure = function ($value, $key) use ($search) {
     *     return $value === $search;
     * };
     * a(['foo', 'bar', 'lall'])->findKey($closure); // 0
     * </code>
     *
     * @param \Closure $closure
     *
     * @return false|int|string
     *                          <p>Return false if we did not find the key.</p>
     *
     * @phpstan-param \Closure(T,TKey):bool $closure
     * @phpstan-return TKey|false
     */
    public function findKey(\Closure $closure)
    {
        foreach ($this->getGenerator() as $key => $value) {
            if ($closure($value, $key)) {
                return $key;
            }
        }

        return false;
    }

    /**
     * find by ...
     *
     * EXAMPLE: <code>
     * $array = [
     *     0 => ['id' => 123, 'name' => 'foo', 'group' => 'primary', 'value' => 123456, 'when' => '2014-01-01'],
     *     1 => ['id' => 456, 'name' => 'bar', 'group' => 'primary', 'value' => 1468, 'when' => '2014-07-15'],
     * ];
     * a($array)->filterBy('name', 'foo'); // Arrayy[0 => ['id' => 123, 'name' => 'foo', 'group' => 'primary', 'value' => 123456, 'when' => '2014-01-01']]
     * </code>
     *
     * @param string $property
     * @param mixed  $value
     * @param string $comparisonOp
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param array<array-key, mixed>|T $value
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function findBy(string $property, $value, string $comparisonOp = 'eq'): self
    {
        return $this->filterBy($property, $value, $comparisonOp);
    }

    /**
     * Get the first value from the current array.
     *
     * EXAMPLE: <code>
     * a([2 => 'foo', 3 => 'bar', 4 => 'lall'])->first(); // 'foo'
     * </code>
     *
     * @return mixed|null
     *                    <p>Return null if there wasn't a element.</p>
     *
     * @phpstan-return T|null
     * @psalm-mutation-free
     */
    public function first()
    {
        $key_first = $this->firstKey();
        if ($key_first === null) {
            return null;
        }

        return $this->get($key_first);
    }

    /**
     * Get the first key from the current array.
     *
     * @return mixed|null
     *                    <p>Return null if there wasn't a element.</p>
     *
     * @phpstan-return TKey|null
     *
     * @psalm-mutation-free
     */
    public function firstKey()
    {
        $this->generatorToArray();

        /** @phpstan-var TKey|null $return - help for phpstan */
        $return = \array_key_first($this->array);

        return $return;
    }

    /**
     * Get the first value(s) from the current array.
     * And will return an empty array if there was no first entry.
     *
     * EXAMPLE: <code>
     * a([2 => 'foo', 3 => 'bar', 4 => 'lall'])->firstsImmutable(2); // Arrayy[0 => 'foo', 1 => 'bar']
     * </code>
     *
     * @param int|null $number <p>How many values you will take?</p>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function firstsImmutable(?int $number = null): self
    {
        $arrayTmp = $this->toArray();

        if ($number === null) {
            $array = (array) \array_shift($arrayTmp);
        } else {
            $array = \array_splice($arrayTmp, 0, $number);
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $array,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Get the first value(s) from the current array.
     * And will return an empty array if there was no first entry.
     *
     * @param int|null $number <p>How many values you will take?</p>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function firstsKeys(?int $number = null): self
    {
        $arrayTmp = $this->keys()->toArray();

        if ($number === null) {
            $array = (array) \array_shift($arrayTmp);
        } else {
            $array = \array_splice($arrayTmp, 0, $number);
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $array,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Get and remove the first value(s) from the current array.
     * And will return an empty array if there was no first entry.
     *
     * EXAMPLE: <code>
     * a([2 => 'foo', 3 => 'bar', 4 => 'lall'])->firstsMutable(); // 'foo'
     * </code>
     *
     * @param int|null $number <p>How many values you will take?</p>
     *
     * @return $this
     *               <p>(Mutable)</p>
     *
     * @phpstan-return ($number is null ? static : static)
     */
    public function firstsMutable(?int $number = null): self
    {
        $this->generatorToArray();

        if ($number === null) {
            $shift = \array_shift($this->array);
            /* @phpstan-ignore assign.propertyType */
            $this->array = $shift !== null ? [$shift] : [];
        } else {
            $splice = \array_splice($this->array, 0, $number);
            $this->array = $splice;
        }

        return $this;
    }

    /**
     * Exchanges all keys with their associated values in an array.
     *
     * EXAMPLE: <code>
     * a([0 => 'foo', 1 => 'bar'])->flip(); // Arrayy['foo' => 0, 'bar' => 1]
     * </code>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function flip(): self
    {
        $generator = function (): \Generator {
            foreach ($this->getGenerator() as $key => $value) {
                yield (string) $value => $key;
            }
        };

        return static::create(
            $generator,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Get a value from an array (optional using dot-notation).
     *
     * EXAMPLE: <code>
     * $arrayy = a(['user' => ['lastname' => 'Moelleken']]);
     * $arrayy->get('user.lastname'); // 'Moelleken'
     * // ---
     * $arrayy = new A();
     * $arrayy['user'] = ['lastname' => 'Moelleken'];
     * $arrayy['user.firstname'] = 'Lars';
     * $arrayy['user']['lastname']; // Moelleken
     * $arrayy['user.lastname']; // Moelleken
     * $arrayy['user.firstname']; // Lars
     * </code>
     *
     * @param int|string $key
     *                                   <p>The key to look for.</p>
     * @param mixed      $fallback
     *                                   <p>Value to fallback to.</p>
     * @param array|null $array
     *                                   <p>The array to get from, if it's set to "null" we use the current array from the
     *                                   class.</p>
     * @param bool       $useByReference
     *
     * @return mixed|static
     *
     * @phpstan-param TKey $key
     * @phpstan-param array<array-key,mixed>|array<TKey,T> $array
     * @psalm-mutation-free
     */
    public function get(
        $key = null,
        $fallback = null,
        ?array $array = null,
        bool $useByReference = false
    ) {
        if ($array === null && $key === null) {
            if ($useByReference) {
                return $this;
            }

            return clone $this;
        }

        if ($array !== null) {
            if ($useByReference) {
                $usedArray = &$array;
            } else {
                $usedArray = $array;
            }
        } else {
            $this->generatorToArray();

            if ($useByReference) {
                $usedArray = &$this->array;
            } else {
                $usedArray = $this->array;
            }
        }

        if ($key === null) {
            return static::create(
                /* @phpstan-ignore-next-line argument.type */
                [],
                $this->iteratorClass,
                false
            )->createByReference($usedArray);
        }

        // php cast "bool"-index into "int"-index
        /* @phpstan-ignore identical.alwaysFalse */
        if ((bool) $key === $key) {
            $key = (int) $key;
        }

        if (\array_key_exists($key, $usedArray) === true) {
            if (\is_array($usedArray[$key])) {
                return static::create(
                    /* @phpstan-ignore-next-line argument.type */
                    [],
                    $this->iteratorClass,
                    false
                )->createByReference($usedArray[$key]);
            }

            return $usedArray[$key];
        }

        // crawl through array, get key according to object or not
        $usePath = false;
        if (
            $this->pathSeparator
            &&
            (string) $key === $key
            &&
            \strpos($key, $this->pathSeparator) !== false
        ) {
            $segments = \explode($this->pathSeparator, (string) $key);
            $usePath = true;
            $usedArrayTmp = $usedArray; // do not use the reference for dot-annotations

            foreach ($segments as $segment) {
                if (
                    (
                        \is_array($usedArrayTmp)
                        ||
                        $usedArrayTmp instanceof \ArrayAccess
                    )
                    &&
                    isset($usedArrayTmp[$segment])
                ) {
                    $usedArrayTmp = $usedArrayTmp[$segment];

                    continue;
                }

                if (
                    \is_object($usedArrayTmp) === true
                    &&
                    \property_exists($usedArrayTmp, $segment)
                ) {
                    $usedArrayTmp = $usedArrayTmp->{$segment};

                    continue;
                }

                if ($segments[0] === '*') {
                    $segmentsTmp = $segments;
                    unset($segmentsTmp[0]);
                    $keyTmp = \implode('.', $segmentsTmp);
                    $returnTmp = static::create(
                        /* @phpstan-ignore-next-line argument.type */
                        [],
                        $this->iteratorClass,
                        false
                    );
                    foreach ($this->getAll() as $dataTmp) {
                        if ($dataTmp instanceof self) {
                            $returnTmp->add($dataTmp->get($keyTmp));

                            continue;
                        }

                        if (
                            (
                                \is_array($dataTmp)
                                ||
                                $dataTmp instanceof \ArrayAccess
                            )
                            &&
                            isset($dataTmp[$keyTmp])
                        ) {
                            $returnTmp->add($dataTmp[$keyTmp]);

                            continue;
                        }

                        if (
                            \is_object($dataTmp) === true
                            &&
                            \property_exists($dataTmp, $keyTmp)
                        ) {
                            $returnTmp->add($dataTmp->{$keyTmp});

                            continue;
                        }
                    }

                    if ($returnTmp->count() > 0) {
                        return $returnTmp;
                    }
                }

                return $fallback instanceof \Closure ? $fallback() : $fallback;
            }

            if (\is_array($usedArrayTmp)) {
                return static::create(
                    /* @phpstan-ignore-next-line argument.type */
                    [],
                    $this->iteratorClass,
                    false
                )->createByReference($usedArrayTmp);
            }

            return $usedArrayTmp;
        }

        if (!isset($usedArray[$key])) {
            return $fallback instanceof \Closure ? $fallback() : $fallback;
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            [],
            $this->iteratorClass,
            false
        )->createByReference($usedArray);
    }

    /**
     * alias: for "Arrayy->toArray()"
     *
     * @return array
     *
     * @see          Arrayy::getArray()
     *
     * @phpstan-return array<TKey,T>
     */
    public function getAll(): array
    {
        /** @var array<TKey,T> $return */
        $return = $this->toArray();

        return $return;
    }

    /**
     * Get the current array from the "Arrayy"-object.
     *
     * alias for "toArray()"
     *
     * @param bool $convertAllArrayyElements <p>
     *                                       Convert all Child-"Arrayy" objects also to arrays.
     *                                       </p>
     * @param bool $preserveKeys             <p>
     *                                       e.g.: A generator maybe return the same key more than once,
     *                                       so maybe you will ignore the keys.
     *                                       </p>
     *
     * @return array
     *
     * @phpstan-return array<array-key,T>|array<TKey,T>
     * @psalm-mutation-free
     *
     * @see Arrayy::toArray()
     */
    public function getArray(
        bool $convertAllArrayyElements = false,
        bool $preserveKeys = true
    ): array {
        return $this->toArray(
            $convertAllArrayyElements,
            $preserveKeys
        );
    }

    /**
     * Create an instance from JSON using the built-in mapper.
     *
     * For Arrayy models with property checks enabled, phpdoc array-shape annotations,
     * legacy `@property` definitions, and native declared properties are used for metadata and type checks.
     * Add a property-level `@var` annotation if a native `array` property also needs
     * element-type validation.
     *
     * @param string $json
     *
     * @return static
     *                <p>(Immutable)</p>
     */
    public static function createFromJsonMapper(string $json)
    {
        // init
        $class = static::create();

        $jsonObject = \json_decode($json, false);

        $mapper = new \Arrayy\Mapper\Json();
        $mapper->undefinedPropertyHandler = static function ($object, $key, $jsonValue) use ($class) {
            if ($class->checkPropertiesMismatchInConstructor) {
                throw new \TypeError('Property mismatch - input: ' . \print_r(['key' => $key, 'jsonValue' => $jsonValue], true) . ' for object: ' . \get_class($object));
            }
        };

        /** @var static $return - hack for phpstan */
        $return = $mapper->map($jsonObject, $class);

        return $return;
    }

    /**
     * @return array<array-key,TypeCheckInterface>|TypeCheckArray<array-key,TypeCheckInterface>
     *
     * @internal
     */
    public function getPhpDocPropertiesFromClass()
    {
        if ($this->properties === []) {
            $this->properties = $this->getPropertiesFromPhpDoc();
        }

        return $this->properties;
    }

    /**
     * Get the current array from the "Arrayy"-object as list.
     *
     * alias for "toList()"
     *
     * @param bool $convertAllArrayyElements <p>
     *                                       Convert all Child-"Arrayy" objects also to arrays.
     *                                       </p>
     *
     * @return array
     *
     * @phpstan-return list<T>
     * @psalm-mutation-free
     *
     * @see Arrayy::toList()
     */
    public function getList(bool $convertAllArrayyElements = false): array
    {
        return $this->toList($convertAllArrayyElements);
    }

    /**
     * Returns the values from a single column of the input array, identified by
     * the $columnKey, can be used to extract data-columns from multi-arrays.
     *
     * EXAMPLE: <code>
     * a([['foo' => 'bar', 'id' => 1], ['foo => 'lall', 'id' => 2]])->getColumn('foo', 'id'); // Arrayy[1 => 'bar', 2 => 'lall']
     * </code>
     *
     * INFO: Optionally, you may provide an $indexKey to index the values in the returned
     *       array by the values from the $indexKey column in the input array.
     *
     * @param int|string|null $columnKey
     * @param int|string|null $indexKey
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function getColumn($columnKey = null, $indexKey = null): self
    {
        if ($columnKey === null && $indexKey === null) {
            $generator = function () {
                foreach ($this->getGenerator() as $value) {
                    yield $value;
                }
            };
        } else {
            $generator = function () use ($columnKey, $indexKey) {
                foreach ($this->getGenerator() as $value) {
                    // reset
                    $newKey = null;
                    $newValue = null;
                    $newValueFound = false;

                    if ($indexKey !== null) {
                        foreach ($value as $keyInner => $valueInner) {
                            if ($indexKey === $keyInner) {
                                $newKey = $valueInner;
                            }

                            if ($columnKey === $keyInner) {
                                $newValue = $valueInner;
                                $newValueFound = true;
                            }
                        }
                    } else {
                        foreach ($value as $keyInner => $valueInner) {
                            if ($columnKey === $keyInner) {
                                $newValue = $valueInner;
                                $newValueFound = true;
                            }
                        }
                    }

                    if ($newValueFound === false) {
                        if ($newKey !== null) {
                            yield $newKey => $value;
                        } else {
                            yield $value;
                        }
                    } else {
                        /** @noinspection NestedPositiveIfStatementsInspection */
                        if ($newKey !== null) {
                            yield $newKey => $newValue;
                        } else {
                            yield $newValue;
                        }
                    }
                }
            };
        }

        return static::create(
            $generator,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Get the current array from the "Arrayy"-object as generator by reference.
     *
     * @return \Generator
     *
     * @phpstan-return \Generator<mixed,T>|\Generator<TKey,T>
     */
    public function &getGeneratorByReference(): \Generator
    {
        if ($this->generator instanceof ArrayyRewindableGenerator) {
            foreach ($this->generator as $key => $value) {
                yield $key => $value;
            }

            return;
        }

        // -> false-positive -> see "&$value"
        /** @noinspection PhpParameterByRefIsNotUsedAsReferenceInspection */
        foreach ($this->array as $key => &$value) {
            yield $key => $value;
        }
    }

    /**
     * Get the current array from the "Arrayy"-object as generator.
     *
     * @return \Generator
     *
     * @phpstan-return \Generator<mixed,T>|\Generator<TKey,T>
     * @psalm-mutation-free
     */
    public function getGenerator(): \Generator
    {
        if ($this->generator instanceof ArrayyRewindableGenerator) {
            yield from $this->generator;

            return;
        }

        yield from $this->array;
    }

    /**
     * Get the current array from the "Arrayy"-object as generator.
     *
     * @return \Generator
     *
     * @phpstan-return \Generator<mixed,T>|\Generator<TKey,T>
     * @psalm-mutation-free
     */
    public function getBackwardsGenerator(): \Generator
    {
        yield from $this->reverseKeepIndex();
    }

    /**
     * alias: for "Arrayy->keys()"
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @see          Arrayy::keys()
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function getKeys()
    {
        return $this->keys();
    }

    /**
     * Get the current array from the "Arrayy"-object as object.
     *
     * @return \stdClass
     */
    public function getObject(): \stdClass
    {
        return self::arrayToObject($this->toArray());
    }

    /**
     * alias: for "Arrayy->randomImmutable()"
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @see          Arrayy::randomImmutable()
     *
     * @phpstan-return static
     */
    public function getRandom(): self
    {
        return $this->randomImmutable();
    }

    /**
     * alias: for "Arrayy->randomKey()"
     *
     * @return mixed|null
     *                    <p>Get a key/index or null if there wasn't a key/index.</p>
     *
     * @phpstan-return null|TKey
     *
     * @see Arrayy::randomKey()
     */
    public function getRandomKey()
    {
        return $this->randomKey();
    }

    /**
     * alias: for "Arrayy->randomKeys()"
     *
     * @param int $number
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @see          Arrayy::randomKeys()
     *
     * @phpstan-return static
     */
    public function getRandomKeys(int $number): self
    {
        return $this->randomKeys($number);
    }

    /**
     * alias: for "Arrayy->randomValue()"
     *
     * @return mixed|null
     *                    <p>Get a random value or null if there wasn't a value.</p>
     *
     * @phpstan-return null|T
     *
     * @see Arrayy::randomValue()
     */
    public function getRandomValue()
    {
        return $this->randomValue();
    }

    /**
     * alias: for "Arrayy->randomValues()"
     *
     * @param int $number
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @see          Arrayy::randomValues()
     *
     * @phpstan-return static
     */
    public function getRandomValues(int $number): self
    {
        return $this->randomValues($number);
    }

    /**
     * Gets all values.
     *
     * @return static
     *                <p>The values of all elements in this array, in the order they
     *                appear in the array.</p>
     *
     * @phpstan-return static
     */
    public function getValues()
    {
        $this->generatorToArray(false);

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            \array_values($this->array),
            $this->iteratorClass,
            false
        );
    }

    /**
     * Gets all values via Generator.
     *
     * @return \Generator
     *                    <p>The values of all elements in this array, in the order they
     *                    appear in the array as Generator.</p>
     *
     * @phpstan-return \Generator<TKey,T>
     */
    public function getValuesYield(): \Generator
    {
        yield from $this->getGenerator();
    }

    /**
     * Group values from a array according to the results of a closure.
     *
     * @param callable|int|string $grouper  <p>A callable function name.</p>
     * @param bool                $saveKeys
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param \Closure(T,TKey):TKey|TKey $grouper
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function group($grouper, bool $saveKeys = false): self
    {
        // init
        $result = [];

        // Iterate over values, group by property/results from closure.
        foreach ($this->getGenerator() as $key => $value) {
            if (\is_callable($grouper) === true) {
                $groupKey = $grouper($value, $key);
            } else {
                $groupKey = $this->get($grouper);
            }

            $newValue = $this->get($groupKey, null, $result);

            if ($groupKey instanceof self) {
                $groupKey = $groupKey->toArray();
            }

            if ($newValue instanceof self) {
                $newValue = $newValue->toArray();
            }

            // Add to result.
            if ($groupKey !== null) {
                $result[$groupKey] = $newValue;

                if ($saveKeys) {
                    $result[$groupKey][$key] = $value;
                } else {
                    $result[$groupKey][] = $value;
                }
            }
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $result,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Check if an array has a given key.
     *
     * @param mixed $key
     *
     * @return bool
     *
     * @phpstan-param null|TKey|TKey[] $key
     */
    public function has($key): bool
    {
        static $UN_FOUND = null;

        if ($UN_FOUND === null) {
            // Generate unique string to use as marker.
            $UN_FOUND = 'arrayy--' . \uniqid('arrayy', true);
        }

        if (\is_array($key)) {
            if ($key === []) {
                return false;
            }

            foreach ($key as $keyTmp) {
                $found = ($this->get($keyTmp, $UN_FOUND) !== $UN_FOUND);
                if ($found === false) {
                    return false;
                }
            }

            return true;
        }

        return $this->get($key, $UN_FOUND) !== $UN_FOUND;
    }

    /**
     * Check if an array has a given value.
     *
     * INFO: If you need to search recursive please use ```contains($value, true)```.
     *
     * @param mixed $value
     *
     * @return bool
     *
     * @phpstan-param T $value
     */
    public function hasValue($value): bool
    {
        return $this->contains($value);
    }

    /**
     * Implodes the values of this array.
     *
     * EXAMPLE: <code>
     * a([0 => -9, 1, 2])->implode('|'); // '-9|1|2'
     * </code>
     *
     * @param string $glue
     * @param string $prefix
     *
     * @return string
     * @psalm-mutation-free
     */
    public function implode(string $glue = '', string $prefix = ''): string
    {
        return $prefix . $this->implode_recursive($glue, $this->toArray(), false);
    }

    /**
     * Implodes the keys of this array.
     *
     * @param string $glue
     *
     * @return string
     * @psalm-mutation-free
     */
    public function implodeKeys(string $glue = ''): string
    {
        return $this->implode_recursive($glue, $this->toArray(), true);
    }

    /**
     * Given a list and an iterate-function that returns
     * a key for each element in the list (or a property name),
     * returns an object with an index of each item.
     *
     * @param int|string $key
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param array-key $key
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function indexBy($key): self
    {
        // init
        $results = [];

        foreach ($this->getGenerator() as $a) {
            if (\array_key_exists($key, $a) === true) {
                $results[$a[$key]] = $a;
            }
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $results,
            $this->iteratorClass,
            false
        );
    }

    /**
     * alias: for "Arrayy->searchIndex()"
     *
     * @param mixed $value
     *                     <p>The value to search for.</p>
     *
     * @return false|int|string
     *
     * @phpstan-param T $value
     * @phpstan-return false|TKey
     *
     * @see Arrayy::searchIndex()
     */
    public function indexOf($value)
    {
        return $this->searchIndex($value);
    }

    /**
     * Get everything but the last..$to items.
     *
     * EXAMPLE: <code>
     * a([2 => 'foo', 3 => 'bar', 4 => 'lall'])->initial(2); // Arrayy[0 => 'foo']
     * </code>
     *
     * @param int $to
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function initial(int $to = 1): self
    {
        return $this->firstsImmutable(\count($this->toArray(), \COUNT_NORMAL) - $to);
    }

    /**
     * Return an array with all elements found in input array.
     *
     * EXAMPLE: <code>
     * a(['foo', 'bar'])->intersection(['bar', 'baz']); // Arrayy['bar']
     * </code>
     *
     * @param array $search
     * @param bool  $keepKeys
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param  array<TKey,T> $search
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function intersection(array $search, bool $keepKeys = false): self
    {
        if ($keepKeys) {
            /**
             * @psalm-suppress MissingClosureReturnType
             * @psalm-suppress MissingClosureParamType
             */
            return static::create(
                /* @phpstan-ignore-next-line argument.type */
                \array_uintersect(
                    $this->toArray(),
                    $search,
                    static function ($a, $b) {
                        return $a === $b ? 0 : -1;
                    }
                ),
                $this->iteratorClass,
                false
            );
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            \array_values(\array_intersect($this->toArray(), $search)),
            $this->iteratorClass,
            false
        );
    }

    /**
     * Return an array with all elements found in input array.
     *
     * @param array ...$array
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param  array<array<TKey,T>> ...$array
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function intersectionMulti(...$array): self
    {
        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            \array_values(\array_intersect($this->toArray(), ...$array)),
            $this->iteratorClass,
            false
        );
    }

    /**
     * Return a boolean flag which indicates whether the two input arrays have any common elements.
     *
     * EXAMPLE: <code>
     * a(['foo', 'bar'])->intersects(['föö', 'bär']); // false
     * </code>
     *
     * @param array $search
     *
     * @return bool
     *
     * @phpstan-param array<TKey,T> $search
     */
    public function intersects(array $search): bool
    {
        return $this->intersection($search)->count() > 0;
    }

    /**
     * Invoke a function on all of an array's values.
     *
     * @param callable $callable
     * @param mixed    $arguments
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param  callable(T,mixed=):mixed $callable
     * @phpstan-return static|static
     * @psalm-mutation-free
     */
    public function invoke($callable, $arguments = []): self
    {
        // If one argument given for each iteration, create an array for it.
        if (!\is_array($arguments)) {
            $arguments = \array_fill(
                0,
                $this->count(),
                $arguments
            );
        }

        // If the callable has arguments, pass them.
        if ($arguments) {
            $array = \array_map($callable, $this->toArray(), $arguments);
        } else {
            $array = $this->map($callable);
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $array,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Check whether array is associative or not.
     *
     * EXAMPLE: <code>
     * a(['foo' => 'bar', 2, 3])->isAssoc(); // true
     * </code>
     *
     * @param bool $recursive
     *
     * @return bool
     *              <p>Returns true if associative, false otherwise.</p>
     */
    public function isAssoc(bool $recursive = false): bool
    {
        if ($this->isEmpty()) {
            return false;
        }

        /** @noinspection PhpParameterByRefIsNotUsedAsReferenceInspection */
        foreach ($this->keys($recursive)->getGeneratorByReference() as &$key) {
            if ((string) $key !== $key) {
                return false;
            }
        }

        return true;
    }

    /**
     * Check if a given key or keys are empty.
     *
     * @param int|int[]|string|string[]|null $keys
     *
     * @return bool
     *              <p>Returns true if empty, false otherwise.</p>
     * @psalm-mutation-free
     */
    public function isEmpty($keys = null): bool
    {
        if ($this->generator) {
            return $this->toArray() === [];
        }

        if ($keys === null) {
            return $this->array === [];
        }

        foreach ((array) $keys as $key) {
            if (!empty($this->get($key))) {
                return false;
            }
        }

        return true;
    }

    /**
     * Check if the current array is equal to the given "$array" or not.
     *
     * EXAMPLE: <code>
     * a(['💩'])->isEqual(['💩']); // true
     * </code>
     *
     * @param array $array
     *
     * @return bool
     *
     * @phpstan-param array<TKey,T> $array
     */
    public function isEqual(array $array): bool
    {
        return $this->toArray() === $array;
    }

    /**
     * Check if the current array is a multi-array.
     *
     * EXAMPLE: <code>
     * a(['foo' => [1, 2 , 3]])->isMultiArray(); // true
     * </code>
     *
     * @return bool
     */
    public function isMultiArray(): bool
    {
        foreach ($this->getGenerator() as $value) {
            if (\is_array($value)) {
                return true;
            }
        }

        return false;
    }

    /**
     * Check whether array is numeric or not.
     *
     * @return bool
     *              <p>Returns true if numeric, false otherwise.</p>
     */
    public function isNumeric(): bool
    {
        if ($this->isEmpty()) {
            return false;
        }

        /** @noinspection PhpParameterByRefIsNotUsedAsReferenceInspection */
        foreach ($this->keys()->getGeneratorByReference() as &$key) {
            if ((int) $key !== $key) {
                return false;
            }
        }

        return true;
    }

    /**
     * Check if the current array is sequential [0, 1, 2, 3, 4, 5 ...] or not.
     *
     * EXAMPLE: <code>
     * a([0 => 'foo', 1 => 'lall', 2 => 'foobar'])->isSequential(); // true
     * </code>
     *
     * INFO: If the array is empty we count it as non-sequential.
     *
     * @param bool $recursive
     *
     * @return bool
     * @psalm-mutation-free
     */
    public function isSequential(bool $recursive = false): bool
    {
        $i = 0;
        foreach ($this->getGenerator() as $key => $value) {
            if (
                $recursive
                &&
                (\is_array($value) || $value instanceof \Traversable)
                &&
                /* @phpstan-ignore-next-line argument.type */
                self::create($value)->isSequential() === false
            ) {
                return false;
            }

            if ($key !== $i) {
                return false;
            }

            ++$i;
        }

        return !($i === 0);
    }

    /**
     * @return array
     *
     * @phpstan-return array<TKey,T>
     */
    public function jsonSerialize(): array
    {
        /** @var array<TKey,T> $return */
        $return = $this->toArray();

        return $return;
    }

    /**
     * Gets the key/index of the element at the current internal iterator position.
     *
     * @return int|string|null
     * @phpstan-return array-key|null
     */
    public function key()
    {
        if ($this->generator) {
            return $this->generator->key();
        }

        return \key($this->array);
    }

    /**
     * Checks if the given key exists in the provided array.
     *
     * INFO: This method only use "array_key_exists()" if you want to use "dot"-notation,
     *       then you need to use "Arrayy->offsetExists()".
     *
     * @param int|string $key the key to look for
     *
     * @return bool
     * @psalm-mutation-free
     */
    public function keyExists($key): bool
    {
        foreach ($this->getGenerator() as $keyTmp => $value) {
            if ($key === $keyTmp) {
                return true;
            }
        }

        return false;
    }

    /**
     * Get all keys from the current array.
     *
     * EXAMPLE: <code>
     * a([1 => 'foo', 2 => 'foo2', 3 => 'bar'])->keys(); // Arrayy[1, 2, 3]
     * </code>
     *
     * @param bool       $recursive
     *                                  [optional] <p>
     *                                  Get all keys, also from all sub-arrays from an multi-dimensional array.
     *                                  </p>
     * @param mixed|null $search_values
     *                                  [optional] <p>
     *                                  If specified, then only keys containing these values are returned.
     *                                  </p>
     * @param bool       $strict
     *                                  [optional] <p>
     *                                  Determines if strict comparison (===) should be used during the search.
     *                                  </p>
     *
     * @return static
     *                <p>(Immutable) An array of all the keys in input.</p>
     *
     * @phpstan-param null|T|T[] $search_values
     * @phpstan-return static
     *
     * @psalm-mutation-free
     */
    public function keys(
        bool $recursive = false,
        $search_values = null,
        bool $strict = true
    ): self {
        // recursive

        if ($recursive === true) {
            $array = $this->array_keys_recursive(
                null,
                $search_values,
                $strict
            );

            return static::create(
                /* @phpstan-ignore-next-line argument.type */
                $array,
                $this->iteratorClass,
                false
            );
        }

        // non recursive

        if ($search_values === null) {
            $arrayFunction = function (): \Generator {
                foreach ($this->getGenerator() as $key => $value) {
                    yield $key;
                }
            };
        } else {
            $arrayFunction = function () use ($search_values, $strict): \Generator {
                $is_array_tmp = \is_array($search_values);

                /** @noinspection PhpParameterByRefIsNotUsedAsReferenceInspection */
                foreach ($this->getGeneratorByReference() as $key => &$value) {
                    if (
                        (
                            $is_array_tmp === false
                            &&
                            $strict === true
                            &&
                            $search_values === $value
                        )
                        ||
                        (
                            $is_array_tmp === false
                            &&
                            $strict === false
                            &&
                            $search_values == $value
                        )
                        ||
                        (
                            $is_array_tmp === true
                            &&
                            \in_array($value, $search_values, $strict)
                        )
                    ) {
                        yield $key;
                    }
                }
            };
        }

        return static::create(
            $arrayFunction,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Sort an array by key in reverse order.
     *
     * @param int $sort_flags [optional] <p>
     *                        You may modify the behavior of the sort using the optional
     *                        parameter sort_flags, for details
     *                        see sort.
     *                        </p>
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     */
    public function krsort(int $sort_flags = 0): self
    {
        $this->generatorToArray();

        \krsort($this->array, $sort_flags);

        return $this;
    }

    /**
     * Sort an array by key in reverse order.
     *
     * @param int $sort_flags [optional] <p>
     *                        You may modify the behavior of the sort using the optional
     *                        parameter sort_flags, for details
     *                        see sort.
     *                        </p>
     *
     * @return $this
     *               <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function krsortImmutable(int $sort_flags = 0): self
    {
        $that = clone $this;

        /**
         * @psalm-suppress ImpureMethodCall - object is already cloned
         */
        $that->krsort($sort_flags);

        return $that;
    }

    /**
     * Get the last value from the current array.
     *
     * EXAMPLE: <code>
     * a([2 => 'foo', 3 => 'bar', 4 => 'lall'])->last(); // 'lall'
     * </code>
     *
     * @return mixed|null
     *                    <p>Return null if there wasn't a element.</p>
     *
     * @phpstan-return T|null
     * @psalm-mutation-free
     */
    public function last()
    {
        $key_last = $this->lastKey();
        if ($key_last === null) {
            return null;
        }

        /** @var T $value_last */
        $value_last = $this->get($key_last);

        return $value_last;
    }

    /**
     * Get the last key from the current array.
     *
     * @return mixed|null
     *                    <p>Return null if there wasn't a element.</p>
     *
     * @phpstan-return null|TKey
     * @psalm-mutation-free
     */
    public function lastKey()
    {
        $this->generatorToArray();

        return \array_key_last($this->array);
    }

    /**
     * Get the last value(s) from the current array.
     *
     * EXAMPLE: <code>
     * a([2 => 'foo', 3 => 'bar', 4 => 'lall'])->lasts(2); // Arrayy[0 => 'bar', 1 => 'lall']
     * </code>
     *
     * @param int|null $number
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function lastsImmutable(?int $number = null): self
    {
        if ($this->isEmpty()) {
            return static::create(
                /* @phpstan-ignore-next-line argument.type */
                [],
                $this->iteratorClass,
                false
            );
        }

        if ($number === null) {
            $poppedValue = $this->last();

            if ($poppedValue === null) {
                $poppedValue = [$poppedValue];
            } else {
                $poppedValue = (array) $poppedValue;
            }

            $arrayy = static::create(
                /* @phpstan-ignore-next-line argument.type */
                $poppedValue,
                $this->iteratorClass,
                false
            );
        } else {
            $arrayy = $this->rest(-$number);
        }

        return $arrayy;
    }

    /**
     * Get the last value(s) from the current array.
     *
     * EXAMPLE: <code>
     * a([2 => 'foo', 3 => 'bar', 4 => 'lall'])->lasts(2); // Arrayy[0 => 'bar', 1 => 'lall']
     * </code>
     *
     * @param int|null $number
     *
     * @return $this
     *               <p>(Mutable)</p>
     *
     * @phpstan-return static
     */
    public function lastsMutable(?int $number = null): self
    {
        if ($this->isEmpty()) {
            return $this;
        }

        $this->array = $this->lastsImmutable($number)->toArray();
        $this->generator = null;

        return $this;
    }

    /**
     * Count the values from the current array.
     *
     * alias: for "Arrayy->count()"
     *
     * @param int $mode
     *
     * @return int
     *
     * @see Arrayy::count()
     */
    public function length(int $mode = \COUNT_NORMAL): int
    {
        return $this->count($mode);
    }

    /**
     * Apply the given function to the every element of the array,
     * collecting the results.
     *
     * EXAMPLE: <code>
     * a(['foo', 'Foo'])->map('mb_strtoupper'); // Arrayy['FOO', 'FOO']
     * </code>
     *
     * @param callable $callable
     * @param bool     $useKeyAsSecondParameter
     * @param mixed    ...$arguments
     *
     * @return static
     *                <p>(Immutable) Arrayy object with modified elements.</p>
     *
     * @template T2
     *              <p>The output value type.</p>
     *
     * @phpstan-param callable(T,TKey=,mixed=):T2 $callable
     * @phpstan-return static<TKey,T2,array<TKey,T2>>
     * @psalm-mutation-free
     */
    public function map(
        callable $callable,
        bool $useKeyAsSecondParameter = false,
        ...$arguments
    ) {
        /**
         * @psalm-suppress ImpureFunctionCall - func_num_args is only used to detect the number of args
         */
        $useArguments = \func_num_args() > 2;

        return static::create(
            function () use ($useArguments, $callable, $useKeyAsSecondParameter, $arguments) {
                foreach ($this->getGenerator() as $key => $value) {
                    if ($useArguments) {
                        if ($useKeyAsSecondParameter) {
                            yield $key => $callable($value, $key, ...$arguments);
                        } else {
                            yield $key => $callable($value, ...$arguments);
                        }
                    } else {
                        /** @noinspection NestedPositiveIfStatementsInspection */
                        if ($useKeyAsSecondParameter) {
                            yield $key => $callable($value, $key);
                        } else {
                            yield $key => $callable($value);
                        }
                    }
                }
            },
            $this->iteratorClass,
            false
        );
    }

    /**
     * Check if all items in current array match a truth test.
     *
     * EXAMPLE: <code>
     * $closure = function ($value, $key) {
     *     return ($value % 2 === 0);
     * };
     * a([2, 4, 8])->matches($closure); // true
     * </code>
     *
     * @param \Closure $closure
     *
     * @return bool
     *
     * @phpstan-param \Closure(T,TKey):bool $closure
     */
    public function matches(\Closure $closure): bool
    {
        if ($this->count() === 0) {
            return false;
        }

        foreach ($this->getGenerator() as $key => $value) {
            $value = $closure($value, $key);

            if ($value === false) {
                return false;
            }
        }

        return true;
    }

    /**
     * Check if any item in the current array matches a truth test.
     *
     * EXAMPLE: <code>
     * $closure = function ($value, $key) {
     *     return ($value % 2 === 0);
     * };
     * a([1, 4, 7])->matches($closure); // true
     * </code>
     *
     * @param \Closure $closure
     *
     * @return bool
     *
     * @phpstan-param \Closure(T,TKey):bool $closure
     */
    public function matchesAny(\Closure $closure): bool
    {
        if ($this->count() === 0) {
            return false;
        }

        foreach ($this->getGenerator() as $key => $value) {
            $value = $closure($value, $key);

            if ($value === true) {
                return true;
            }
        }

        return false;
    }

    /**
     * Get the max value from an array.
     *
     * EXAMPLE: <code>
     * a([-9, -8, -7, 1.32])->max(); // 1.32
     * </code>
     *
     * @return false|float|int|string
     *                                <p>Will return false if there are no values.</p>
     */
    public function max()
    {
        if ($this->count() === 0) {
            return false;
        }

        $max = false;
        /** @noinspection PhpParameterByRefIsNotUsedAsReferenceInspection */
        foreach ($this->getGeneratorByReference() as &$value) {
            if (
                $max === false
                ||
                $value > $max
            ) {
                $max = $value;
            }
        }

        return $max;
    }

    /**
     * Merge the new $array into the current array.
     *
     * - keep key,value from the current array, also if the index is in the new $array
     *
     * EXAMPLE: <code>
     * $array1 = [1 => 'one', 'foo' => 'bar1'];
     * $array2 = ['foo' => 'bar2', 3 => 'three'];
     * a($array1)->mergeAppendKeepIndex($array2); // Arrayy[1 => 'one', 'foo' => 'bar2', 3 => 'three']
     * // ---
     * $array1 = [0 => 'one', 1 => 'foo'];
     * $array2 = [0 => 'foo', 1 => 'bar2'];
     * a($array1)->mergeAppendKeepIndex($array2); // Arrayy[0 => 'foo', 1 => 'bar2']
     * </code>
     *
     * @param array $array
     * @param bool  $recursive
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param  array<int|TKey,T> $array
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function mergeAppendKeepIndex(array $array = [], bool $recursive = false): self
    {
        if ($recursive === true) {
            $array = $this->getArrayRecursiveHelperArrayy($array);
            $result = \array_replace_recursive($this->toArray(), $array);
        } else {
            $result = \array_replace($this->toArray(), $array);
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $result,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Merge the new $array into the current array.
     *
     * - replace duplicate assoc-keys from the current array with the key,values from the new $array
     * - create new indexes
     *
     * EXAMPLE: <code>
     * $array1 = [1 => 'one', 'foo' => 'bar1'];
     * $array2 = ['foo' => 'bar2', 3 => 'three'];
     * a($array1)->mergeAppendNewIndex($array2); // Arrayy[0 => 'one', 'foo' => 'bar2', 1 => 'three']
     * // ---
     * $array1 = [0 => 'one', 1 => 'foo'];
     * $array2 = [0 => 'foo', 1 => 'bar2'];
     * a($array1)->mergeAppendNewIndex($array2); // Arrayy[0 => 'one', 1 => 'foo', 2 => 'foo', 3 => 'bar2']
     * </code>
     *
     * @param array $array
     * @param bool  $recursive
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param  array<TKey,T> $array
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function mergeAppendNewIndex(array $array = [], bool $recursive = false): self
    {
        if ($recursive === true) {
            $array = $this->getArrayRecursiveHelperArrayy($array);
            $result = \array_merge_recursive($this->toArray(), $array);
        } else {
            $result = \array_merge($this->toArray(), $array);
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $result,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Merge the the current array into the $array.
     *
     * - use key,value from the new $array, also if the index is in the current array
     *
     * EXAMPLE: <code>
     * $array1 = [1 => 'one', 'foo' => 'bar1'];
     * $array2 = ['foo' => 'bar2', 3 => 'three'];
     * a($array1)->mergePrependKeepIndex($array2); // Arrayy['foo' => 'bar1', 3 => 'three', 1 => 'one']
     * // ---
     * $array1 = [0 => 'one', 1 => 'foo'];
     * $array2 = [0 => 'foo', 1 => 'bar2'];
     * a($array1)->mergePrependKeepIndex($array2); // Arrayy[0 => 'one', 1 => 'foo']
     * </code>
     *
     * @param array $array
     * @param bool  $recursive
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param  array<TKey,T> $array
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function mergePrependKeepIndex(array $array = [], bool $recursive = false): self
    {
        if ($recursive === true) {
            $array = $this->getArrayRecursiveHelperArrayy($array);
            $result = \array_replace_recursive($array, $this->toArray());
        } else {
            $result = \array_replace($array, $this->toArray());
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $result,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Merge the current array into the new $array.
     *
     * - replace duplicate assoc-keys from new $array with the key,values from the current array
     * - create new indexes
     *
     * EXAMPLE: <code>
     * $array1 = [1 => 'one', 'foo' => 'bar1'];
     * $array2 = ['foo' => 'bar2', 3 => 'three'];
     * a($array1)->mergePrependNewIndex($array2); // Arrayy['foo' => 'bar1', 0 => 'three', 1 => 'one']
     * // ---
     * $array1 = [0 => 'one', 1 => 'foo'];
     * $array2 = [0 => 'foo', 1 => 'bar2'];
     * a($array1)->mergePrependNewIndex($array2); // Arrayy[0 => 'foo', 1 => 'bar2', 2 => 'one', 3 => 'foo']
     * </code>
     *
     * @param array $array
     * @param bool  $recursive
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param  array<TKey,T> $array
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function mergePrependNewIndex(array $array = [], bool $recursive = false): self
    {
        if ($recursive === true) {
            $array = $this->getArrayRecursiveHelperArrayy($array);
            $result = \array_merge_recursive($array, $this->toArray());
        } else {
            $result = \array_merge($array, $this->toArray());
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $result,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Return a meta object with property names from phpdoc array-shape annotations,
     * `@property` tags, and native declared properties.
     *
     * @return ArrayyMeta|mixed|static
     */
    public static function meta()
    {
        return (new ArrayyMeta())->getMetaObject(static::class);
    }

    /**
     * Get the min value from an array.
     *
     * EXAMPLE: <code>
     * a([-9, -8, -7, 1.32])->min(); // -9
     * </code>
     *
     * @return false|mixed
     *                     <p>Will return false if there are no values.</p>
     *
     * @phpstan-return false|T
     */
    public function min()
    {
        if ($this->count() === 0) {
            return false;
        }

        $min = false;
        /** @noinspection PhpParameterByRefIsNotUsedAsReferenceInspection */
        foreach ($this->getGeneratorByReference() as &$value) {
            if (
                $min === false
                ||
                $value < $min
            ) {
                $min = $value;
            }
        }

        return $min;
    }

    /**
     * Get the most used value from the array.
     *
     * @return mixed|null
     *                    <p>(Immutable) Return null if there wasn't an element.</p>
     *
     * @phpstan-return T|null
     * @psalm-mutation-free
     */
    public function mostUsedValue()
    {
        /* @phpstan-ignore return.type */
        return $this->countValues()->arsortImmutable()->firstKey();
    }

    /**
     * Get the most used value from the array.
     *
     * @param int|null $number <p>How many values you will take?</p>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function mostUsedValues(?int $number = null): self
    {
        return $this->countValues()->arsortImmutable()->firstsKeys($number);
    }

    /**
     * Move an array element to a new index.
     *
     * EXAMPLE: <code>
     * $arr2 = new A(['A' => 'a', 'B' => 'b', 'C' => 'c', 'D' => 'd', 'E' => 'e']);
     * $newArr2 = $arr2->moveElement('D', 1); // Arrayy['A' => 'a', 'D' => 'd', 'B' => 'b', 'C' => 'c', 'E' => 'e']
     * </code>
     *
     * @param int|string $from
     * @param int        $to
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function moveElement($from, $to): self
    {
        $array = $this->toArray();

        if ((int) $from === $from) {
            $tmp = \array_splice($array, $from, 1);
            \array_splice($array, (int) $to, 0, $tmp);
            $output = $array;
        } elseif ((string) $from === $from) {
            $indexToMove = \array_search($from, \array_keys($array), true);
            $itemToMove = $array[$from];
            if ($indexToMove !== false) {
                \array_splice($array, $indexToMove, 1);
            }
            $i = 0;
            $output = [];
            foreach ($array as $key => $item) {
                if ($i === $to) {
                    $output[$from] = $itemToMove;
                }
                $output[$key] = $item;
                ++$i;
            }
        } else {
            $output = [];
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $output,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Move an array element to the first place.
     *
     * INFO: Instead of "Arrayy->moveElement()" this method will NOT
     *       loss the keys of an indexed array.
     *
     * @param int|string $key
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function moveElementToFirstPlace($key): self
    {
        $array = $this->toArray();

        if ($this->offsetExists($key)) {
            $tmpValue = $this->get($key);
            unset($array[$key]);
            $array = [$key => $tmpValue] + $array;
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $array,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Move an array element to the last place.
     *
     * INFO: Instead of "Arrayy->moveElement()" this method will NOT
     *       loss the keys of an indexed array.
     *
     * @param int|string $key
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function moveElementToLastPlace($key): self
    {
        $array = $this->toArray();

        if ($this->offsetExists($key)) {
            $tmpValue = $this->get($key);
            unset($array[$key]);
            $array += [$key => $tmpValue];
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $array,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Moves the internal iterator position to the next element and returns this element.
     *
     * @return false|mixed
     *                     <p>(Mutable) Will return false if there are no values.</p>
     *
     * @phpstan-return false|T
     */
    public function next()
    {
        if ($this->generator) {
            $this->generator->next();

            return $this->generator->current() ?? false;
        }

        return \next($this->array);
    }

    /**
     * Get the next nth keys and values from the array.
     *
     * @param int $step
     * @param int $offset
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function nth(int $step, int $offset = 0): self
    {
        $arrayFunction = function () use ($step, $offset): \Generator {
            $position = 0;
            foreach ($this->getGenerator() as $key => $value) {
                if ($position++ % $step !== $offset) {
                    continue;
                }

                yield $key => $value;
            }
        };

        return static::create(
            $arrayFunction,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Get a subset of the items from the given array.
     *
     * @param int[]|string[] $keys
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param array-key[] $keys
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function only(array $keys): self
    {
        $keys = \array_flip($keys);

        $generator = function () use ($keys): \Generator {
            foreach ($this->getGenerator() as $key => $value) {
                if (isset($keys[$key])) {
                    yield $key => $value;
                }
            }
        };

        return static::create(
            $generator,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Pad array to the specified size with a given value.
     *
     * @param int   $size  <p>Size of the result array.</p>
     * @param mixed $value <p>Empty value by default.</p>
     *
     * @return static
     *                <p>(Immutable) Arrayy object padded to $size with $value.</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function pad(int $size, $value): self
    {
        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            \array_pad($this->toArray(), $size, $value),
            $this->iteratorClass,
            false
        );
    }

    /**
     * Partitions this array in two array according to a predicate.
     * Keys are preserved in the resulting array.
     *
     * @param \Closure $closure
     *                          <p>The predicate on which to partition.</p>
     *
     * @return array<int, static>
     *                    <p>An array with two elements. The first element contains the array
     *                    of elements where the predicate returned TRUE, the second element
     *                    contains the array of elements where the predicate returned FALSE.</p>
     *
     * @phpstan-param \Closure(T,TKey):bool $closure
     * @phpstan-return array<int, static>
     */
    public function partition(\Closure $closure): array
    {
        // init
        $matches = [];
        $noMatches = [];

        foreach ($this->getGenerator() as $key => $value) {
            if ($closure($value, $key)) {
                $matches[$key] = $value;
            } else {
                $noMatches[$key] = $value;
            }
        }

        /* @phpstan-ignore-next-line argument.type */
        return [self::create($matches), self::create($noMatches)];
    }

    /**
     * Pop a specified value off the end of the current array.
     *
     * @return mixed|null
     *                    <p>(Mutable) The popped element from the current array or null if the array is e.g. empty.</p>
     *
     * @phpstan-return T|null
     */
    public function pop()
    {
        $this->generatorToArray();

        return \array_pop($this->array);
    }

    /**
     * Prepend a (key) + value to the current array.
     *
     * EXAMPLE: <code>
     * a(['fòô' => 'bàř'])->prepend('foo'); // Arrayy[0 => 'foo', 'fòô' => 'bàř']
     * </code>
     *
     * @param mixed $value
     * @param mixed $key
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object, with the prepended value.</p>
     *
     * @phpstan-param T $value
     * @phpstan-param TKey|null $key
     * @phpstan-return static
     */
    public function prepend($value, $key = null)
    {
        $this->generatorToArray();

        if ($this->properties !== []) {
            $this->checkType($key, $value);
        }

        if ($key === null) {
            \array_unshift($this->array, $value);
        } else {
            $this->array = [$key => $value] + $this->array; // @phpstan-ignore assign.propertyType
        }

        return $this;
    }

    /**
     * Prepend a (key) + value to the current array.
     *
     * EXAMPLE: <code>
     * a(['fòô' => 'bàř'])->prependImmutable('foo')->getArray(); // [0 => 'foo', 'fòô' => 'bàř']
     * </code>
     *
     * @param mixed $value
     * @param mixed $key
     *
     * @return $this
     *               <p>(Immutable) Return this Arrayy object, with the prepended value.</p>
     *
     * @phpstan-param T $value
     * @phpstan-param TKey $key
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function prependImmutable($value, $key = null)
    {
        $generator = function () use ($key, $value): \Generator {
            if ($this->properties !== []) {
                $this->checkType($key, $value);
            }

            if ($key !== null) {
                yield $key => $value;
            } else {
                yield $value;
            }

            foreach ($this->getGenerator() as $keyOld => $itemOld) {
                yield $keyOld => $itemOld;
            }
        };

        return static::create(
            $generator,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Add a suffix to each key.
     *
     * @param float|int|string $suffix
     *
     * @return static
     *                <p>(Immutable) Return an Arrayy object, with the prepended keys.</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function prependToEachKey($suffix): self
    {
        // init
        $result = [];

        foreach ($this->getGenerator() as $key => $item) {
            if ($item instanceof self) {
                $result[$key] = $item->prependToEachKey($suffix);
            } elseif (\is_array($item)) {
                $result[$key] = self::create(
                    /* @phpstan-ignore-next-line argument.type */
                    $item,
                    $this->iteratorClass,
                    false
                )->prependToEachKey($suffix)
                    ->toArray();
            } else {
                $result[$key . $suffix] = $item;
            }
        }

        return self::create(
            /* @phpstan-ignore-next-line argument.type */
            $result,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Add a suffix to each value.
     *
     * @param float|int|string $suffix
     *
     * @return static
     *                <p>(Immutable) Return an Arrayy object, with the prepended values.</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function prependToEachValue($suffix): self
    {
        // init
        $result = [];

        foreach ($this->getGenerator() as $key => $item) {
            if ($item instanceof self) {
                $result[$key] = $item->prependToEachValue($suffix);
            } elseif (\is_array($item)) {
                $result[$key] = self::create(
                    /* @phpstan-ignore-next-line argument.type */
                    $item,
                    $this->iteratorClass,
                    false
                )->prependToEachValue($suffix)
                    ->toArray();
            } elseif (\is_object($item) === true) {
                $result[$key] = $item;
            } else {
                $result[$key] = $item . $suffix;
            }
        }

        return self::create(
            /* @phpstan-ignore-next-line argument.type */
            $result,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Return the value of a given key and
     * delete the key.
     *
     * @param int|int[]|string|string[]|null $keyOrKeys
     * @param mixed                          $fallback
     *
     * @return mixed
     *
     * @template TFallback $fallback
     * @phpstan-param TFallback $fallback
     * @phpstan-return TFallback|T|T[]
     */
    public function pull($keyOrKeys = null, $fallback = null)
    {
        if ($keyOrKeys === null) {
            $array = $this->toArray();
            $this->clear();

            return $array;
        }

        if (\is_array($keyOrKeys)) {
            $valueOrValues = [];
            foreach ($keyOrKeys as $key) {
                $valueOrValues[] = $this->get($key, $fallback);
                $this->offsetUnset($key);
            }
        } else {
            $valueOrValues = $this->get($keyOrKeys, $fallback);
            $this->offsetUnset($keyOrKeys);
        }

        /** @var T|T[]|TFallback $valueOrValues */
        return $valueOrValues;
    }

    /**
     * Push one or more values onto the end of array at once.
     *
     * @param mixed ...$args
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object, with pushed elements to the end of array.</p>
     *
     * @noinspection ReturnTypeCanBeDeclaredInspection
     *
     * @phpstan-param  array<TKey,T> ...$args
     * @phpstan-return static
     */
    public function push(...$args)
    {
        $this->generatorToArray();

        if (
            $this->checkPropertyTypes
            &&
            $this->properties !== []
        ) {
            foreach ($args as $key => $value) {
                $this->checkType($key, $value);
            }
        }

        \array_push($this->array, ...$args); // @phpstan-ignore assign.propertyType

        return $this;
    }

    /**
     * Get a random value from the current array.
     *
     * EXAMPLE: <code>
     * a([1, 2, 3, 4])->randomImmutable(2); // e.g.: Arrayy[1, 4]
     * </code>
     *
     * @param int|null $number <p>How many values you will take?</p>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     */
    public function randomImmutable(?int $number = null): self
    {
        $this->generatorToArray();

        if ($this->count() === 0) {
            return static::create(
                /* @phpstan-ignore-next-line argument.type */
                [],
                $this->iteratorClass,
                false
            );
        }

        if ($number === null) {
            $arrayRandValue = [$this->array[\array_rand($this->array)]];

            return static::create(
                /* @phpstan-ignore-next-line argument.type */
                $arrayRandValue,
                $this->iteratorClass,
                false
            );
        }

        $arrayTmp = $this->array;
        \shuffle($arrayTmp);

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $arrayTmp,
            $this->iteratorClass,
            false
        )->firstsImmutable($number);
    }

    /**
     * Pick a random key/index from the keys of this array.
     *
     * EXAMPLE: <code>
     * $arrayy = A::create([1 => 'one', 2 => 'two']);
     * $arrayy->randomKey(); // e.g. 2
     * </code>
     *
     * @throws \RangeException If array is empty
     *
     * @return mixed|null
     *                    <p>Get a key/index or null if there wasn't a key/index.</p>
     *
     * @phpstan-return null|TKey
     */
    public function randomKey()
    {
        $result = $this->randomKeys(1);

        if (!isset($result[0])) {
            $result[0] = null;
        }

        return $result[0];
    }

    /**
     * Pick a given number of random keys/indexes out of this array.
     *
     * EXAMPLE: <code>
     * a([1 => 'one', 2 => 'two'])->randomKeys(); // e.g. Arrayy[1, 2]
     * </code>
     *
     * @param int $number <p>The number of keys/indexes (should be <= \count($this->array))</p>
     *
     * @throws \RangeException If array is empty
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     */
    public function randomKeys(int $number): self
    {
        $this->generatorToArray();

        $count = $this->count();

        if (
            $number === 0
            ||
            $number > $count
        ) {
            throw new \RangeException(
                \sprintf(
                    'Number of requested keys (%s) must be equal or lower than number of elements in this array (%s)',
                    $number,
                    $count
                )
            );
        }

        $result = (array) \array_rand($this->array, $number);

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $result,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Get a random value from the current array.
     *
     * EXAMPLE: <code>
     * a([1, 2, 3, 4])->randomMutable(2); // e.g.: Arrayy[1, 4]
     * </code>
     *
     * @param int|null $number <p>How many values you will take?</p>
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     */
    public function randomMutable(?int $number = null): self
    {
        $this->generatorToArray();

        if ($this->count() === 0) {
            return static::create(
                /* @phpstan-ignore-next-line argument.type */
                [],
                $this->iteratorClass,
                false
            );
        }

        if ($number === null) {
            $arrayRandValue = [$this->array[\array_rand($this->array)]];
            $this->array = $arrayRandValue; // @phpstan-ignore assign.propertyType

            return $this;
        }

        \shuffle($this->array);

        return $this->firstsMutable($number);
    }

    /**
     * Pick a random value from the values of this array.
     *
     * EXAMPLE: <code>
     * a([1 => 'one', 2 => 'two'])->randomValue(); // e.g. 'one'
     * </code>
     *
     * @return mixed
     *               <p>Get a random value or null if there wasn't a value.</p>
     *
     * @phpstan-return T|null
     */
    public function randomValue()
    {
        $result = $this->randomImmutable();

        if (!isset($result[0])) {
            $result[0] = null;
        }

        return $result[0];
    }

    /**
     * Pick a given number of random values out of this array.
     *
     * EXAMPLE: <code>
     * a([1 => 'one', 2 => 'two'])->randomValues(); // e.g. Arrayy['one', 'two']
     * </code>
     *
     * @param int $number
     *
     * @return static
     *                <p>(Mutable)</p>
     *
     * @phpstan-return static
     */
    public function randomValues(int $number): self
    {
        return $this->randomMutable($number);
    }

    /**
     * Get a random value from an array, with the ability to skew the results.
     *
     * EXAMPLE: <code>
     * a([0 => 3, 1 => 4])->randomWeighted([1 => 4]); // e.g.: Arrayy[4] (has a 66% chance of returning 4)
     * </code>
     *
     * @param array    $array
     * @param int|null $number <p>How many values you will take?</p>
     *
     * @return static
     *                           <p>(Immutable)</p>
     *
     * @phpstan-param  array<(int&T)|(string&T),int> $array
     * @phpstan-return static
     */
    public function randomWeighted(array $array, ?int $number = null): self
    {
        // init
        $options = [];

        foreach ($array as $option => $weight) {
            if ($this->searchIndex($option) !== false) {
                for ($i = 0; $i < $weight; ++$i) {
                    $options[] = $option;
                }
            }
        }

        return $this->mergeAppendKeepIndex($options)->randomImmutable($number);
    }

    /**
     * Reduce the current array via callable e.g. anonymous-function and return the end result.
     *
     * EXAMPLE: <code>
     * a([1, 2, 3, 4])->reduce(
     *     function ($carry, $item) {
     *         return $carry * $item;
     *     },
     *     1
     * ); // Arrayy[24]
     * </code>
     *
     * @param callable $callable
     * @param mixed    $initial
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @template T2
     *              <p>The output value type.</p>
     *
     * @phpstan-param callable(T2, T, TKey): T2 $callable
     * @phpstan-param T2                        $initial
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function reduce($callable, $initial = []): self
    {
        foreach ($this->getGenerator() as $key => $value) {
            $initial = $callable($initial, $value, $key);
        }

        /** @var static $return - help for phpstan */
        $return = static::create(
            $initial,
            $this->iteratorClass,
            false
        );

        return $return;
    }

    /**
     * @param bool $unique
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function reduce_dimension(bool $unique = true): self
    {
        // init
        $result = [];

        foreach ($this->getGenerator() as $val) {
            if (\is_array($val)) {
                /* @phpstan-ignore-next-line argument.type */
                $result[] = static::create($val)->reduce_dimension($unique)->toArray();
            } else {
                $result[] = [$val];
            }
        }

        $result = $result === [] ? [] : \array_merge(...$result);

        /* @phpstan-ignore-next-line argument.type */
        $resultArrayy = static::create($result);

        /**
         * @psalm-suppress ImpureMethodCall - object is already re-created
         * @psalm-suppress InvalidReturnStatement - why?
         */
        return $unique ? $resultArrayy->unique() : $resultArrayy;
    }

    /**
     * Create a numerically re-indexed Arrayy object.
     *
     * EXAMPLE: <code>
     * a([2 => 1, 3 => 2])->reindex(); // Arrayy[0 => 1, 1 => 2]
     * </code>
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object, with re-indexed array-elements.</p>
     *
     * @phpstan-return static
     */
    public function reindex(): self
    {
        $this->generatorToArray(false);

        $this->array = \array_values($this->array);

        return $this;
    }

    /**
     * Return all items that fail the truth test.
     *
     * EXAMPLE: <code>
     * $closure = function ($value) {
     *     return $value % 2 !== 0;
     * }
     * a([1, 2, 3, 4])->reject($closure); // Arrayy[1 => 2, 3 => 4]
     * </code>
     *
     * @param \Closure $closure
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param \Closure(T,TKey):bool  $closure
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function reject(\Closure $closure): self
    {
        // init
        $filtered = [];

        foreach ($this->getGenerator() as $key => $value) {
            if (!$closure($value, $key)) {
                $filtered[$key] = $value;
            }
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $filtered,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Remove a value from the current array (optional using dot-notation).
     *
     * EXAMPLE: <code>
     * a([1 => 'bar', 'foo' => 'foo'])->remove(1); // Arrayy['foo' => 'foo']
     * </code>
     *
     * @param mixed $key
     *
     * @return static
     *                <p>(Mutable)</p>
     *
     * @phpstan-param  TKey|TKey[] $key
     * @phpstan-return static
     */
    public function remove($key)
    {
        // recursive call
        if (\is_array($key)) {
            foreach ($key as $k) {
                $this->internalRemove($k);
            }

            return static::create(
                /* @phpstan-ignore-next-line argument.type */
                $this->toArray(),
                $this->iteratorClass,
                false
            );
        }

        $this->internalRemove($key);

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $this->toArray(),
            $this->iteratorClass,
            false
        );
    }

    /**
     * alias: for "Arrayy->removeValue()"
     *
     * @param mixed $element
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param  T $element
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function removeElement($element)
    {
        return $this->removeValue($element);
    }

    /**
     * Remove the first value from the current array.
     *
     * EXAMPLE: <code>
     * a([1 => 'bar', 'foo' => 'foo'])->removeFirst(); // Arrayy['foo' => 'foo']
     * </code>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function removeFirst(): self
    {
        $tmpArray = $this->toArray();

        \array_shift($tmpArray);

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $tmpArray,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Remove the last value from the current array.
     *
     * EXAMPLE: <code>
     * a([1 => 'bar', 'foo' => 'foo'])->removeLast(); // Arrayy[1 => 'bar']
     * </code>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function removeLast(): self
    {
        $tmpArray = $this->toArray();

        \array_pop($tmpArray);

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $tmpArray,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Removes a particular value from an array (numeric or associative).
     *
     * EXAMPLE: <code>
     * a([1 => 'bar', 'foo' => 'foo'])->removeValue('foo'); // Arrayy[1 => 'bar']
     * </code>
     *
     * @param mixed $value
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param  T $value
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function removeValue($value): self
    {
        $this->generatorToArray();

        // init
        $isSequentialArray = $this->isSequential();

        foreach ($this->array as $key => $item) {
            if ($item === $value) {
                unset($this->array[$key]);
            }
        }

        if ($isSequentialArray) {
            $this->array = \array_values($this->array);
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $this->array,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Generate array of repeated arrays.
     *
     * @param int $times <p>How many times has to be repeated.</p>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function repeat($times): self
    {
        if ($times === 0) {
            /* @phpstan-ignore-next-line argument.type */
            return static::create([], $this->iteratorClass);
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            \array_fill(0, (int) $times, $this->toArray()),
            $this->iteratorClass,
            false
        );
    }

    /**
     * Replace a key with a new key/value pair.
     *
     * EXAMPLE: <code>
     * $arrayy = a([1 => 'foo', 2 => 'foo2', 3 => 'bar']);
     * $arrayy->replace(2, 'notfoo', 'notbar'); // Arrayy[1 => 'foo', 'notfoo' => 'notbar', 3 => 'bar']
     * </code>
     *
     * @param mixed $oldKey
     * @param mixed $newKey
     * @param mixed $newValue
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param TKey $oldKey
     * @phpstan-param TKey $newKey
     * @phpstan-param T $newValue
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function replace($oldKey, $newKey, $newValue): self
    {
        $that = clone $this;

        /**
         * @psalm-suppress ImpureMethodCall - object is already cloned
         */
        return $that->remove($oldKey)
            ->set($newKey, $newValue);
    }

    /**
     * Create an array using the current array as values and the other array as keys.
     *
     * EXAMPLE: <code>
     * $firstArray = [
     *     1 => 'one',
     *     2 => 'two',
     *     3 => 'three',
     * ];
     * $secondArray = [
     *     'one' => 1,
     *     1     => 'one',
     *     2     => 2,
     * ];
     * $arrayy = a($firstArray);
     * $arrayy->replaceAllKeys($secondArray); // Arrayy[1 => "one", 'one' => "two", 2 => "three"]
     * </code>
     *
     * @param int[]|string[] $keys <p>An array of keys.</p>
     *
     * @return static
     *                <p>(Immutable) Arrayy object with keys from the other array, empty Arrayy object if the number of elements
     *                for each array isn't equal or if the arrays are empty.
     *                </p>
     *
     * @phpstan-param  array<TKey> $keys
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function replaceAllKeys(array $keys): self
    {
        $values = $this->toArray();
        $data = \count($keys) === \count($values) ? \array_combine($keys, $values) : [];

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $data,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Create an array using the current array as keys and the other array as values.
     *
     * EXAMPLE: <code>
     * $firstArray = [
     *     1 => 'one',
     *     2 => 'two',
     *     3 => 'three',
     * ];
     * $secondArray = [
     *     'one' => 1,
     *     1     => 'one',
     *     2     => 2,
     * ];
     * $arrayy = a($firstArray);
     * $arrayy->replaceAllValues($secondArray); // Arrayy['one' => 1, 'two' => 'one', 'three' => 2]
     * </code>
     *
     * @param array $array <p>An array of values.</p>
     *
     * @return static
     *                <p>(Immutable) Arrayy object with values from the other array, empty Arrayy object if the number of elements
     *                for each array isn't equal or if the arrays are empty.
     *                </p>
     *
     * @phpstan-param  array<T> $array
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function replaceAllValues(array $array): self
    {
        $keys = $this->toArray();
        $data = \count($keys) === \count($array) ? \array_combine($keys, $array) : [];

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $data,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Replace the keys in an array with another set.
     *
     * EXAMPLE: <code>
     * a([1 => 'bar', 'foo' => 'foo'])->replaceKeys([1 => 2, 'foo' => 'replaced']); // Arrayy[2 => 'bar', 'replaced' => 'foo']
     * </code>
     *
     * @param array $keys <p>An array of keys matching the array's size.</p>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param  array<TKey> $keys
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function replaceKeys(array $keys): self
    {
        $values = \array_values($this->toArray());
        $result = \count($keys) === \count($values) ? \array_combine($keys, $values) : [];

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $result,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Replace the first matched value in an array.
     *
     * EXAMPLE: <code>
     * $testArray = ['bar', 'foo' => 'foo', 'foobar' => 'foobar'];
     * a($testArray)->replaceOneValue('foo', 'replaced'); // Arrayy['bar', 'foo' => 'replaced', 'foobar' => 'foobar']
     * </code>
     *
     * @param mixed $search      <p>The value to replace.</p>
     * @param mixed $replacement <p>The value to replace.</p>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param T $search
     * @phpstan-param T $replacement
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function replaceOneValue($search, $replacement = ''): self
    {
        $array = $this->toArray();
        $key = \array_search($search, $array, true);

        if ($key !== false) {
            $array[$key] = $replacement;
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $array,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Replace values in the current array.
     *
     * EXAMPLE: <code>
     * $testArray = ['bar', 'foo' => 'foo', 'foobar' => 'foobar'];
     * a($testArray)->replaceValues('foo', 'replaced'); // Arrayy['bar', 'foo' => 'replaced', 'foobar' => 'replacedbar']
     * </code>
     *
     * @param string $search      <p>The value to replace.</p>
     * @param string $replacement <p>What to replace it with.</p>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function replaceValues($search, $replacement = ''): self
    {
        $callable = static function ($value) use ($search, $replacement) {
            return \str_replace($search, $replacement, $value);
        };

        /* @phpstan-ignore-next-line return.type */
        return $this->each($callable);
    }

    /**
     * Get the last elements from index $from until the end of this array.
     *
     * EXAMPLE: <code>
     * a([2 => 'foo', 3 => 'bar', 4 => 'lall'])->rest(2); // Arrayy[0 => 'lall']
     * </code>
     *
     * @param int $from
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function rest(int $from = 1): self
    {
        $tmpArray = $this->toArray();

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            \array_splice($tmpArray, $from),
            $this->iteratorClass,
            false
        );
    }

    /**
     * Return the array in the reverse order.
     *
     * EXAMPLE: <code>
     * a([1 => 1, 2 => 2, 3 => 3])->reverse(); // self[3, 2, 1]
     * </code>
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     */
    public function reverse(): self
    {
        $this->generatorToArray();

        $this->array = \array_reverse($this->array);

        return $this;
    }

    /**
     * Return the array with keys in the reverse order.
     *
     * EXAMPLE: <code>
     * a([1 => 1, 2 => 2, 3 => 3])->reverse(); // self[3 => 3, 2 => 2, 1 => 1]
     * </code>
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     */
    public function reverseKeepIndex(): self
    {
        $this->generatorToArray();

        $this->array = \array_reverse($this->array, true);

        return $this;
    }

    /**
     * Sort an array in reverse order.
     *
     * @param int $sort_flags [optional] <p>
     *                        You may modify the behavior of the sort using the optional
     *                        parameter sort_flags, for details
     *                        see sort.
     *                        </p>
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     */
    public function rsort(int $sort_flags = 0): self
    {
        $this->generatorToArray();

        \rsort($this->array, $sort_flags);

        return $this;
    }

    /**
     * Sort an array in reverse order.
     *
     * @param int $sort_flags [optional] <p>
     *                        You may modify the behavior of the sort using the optional
     *                        parameter sort_flags, for details
     *                        see sort.
     *                        </p>
     *
     * @return $this
     *               <p>(Immutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function rsortImmutable(int $sort_flags = 0): self
    {
        $that = clone $this;

        /**
         * @psalm-suppress ImpureMethodCall - object is already cloned
         */
        $that->rsort($sort_flags);

        return $that;
    }

    /**
     * Search for the first index of the current array via $value.
     *
     * EXAMPLE: <code>
     * a(['fòô' => 'bàř', 'lall' => 'bàř'])->searchIndex('bàř'); // Arrayy[0 => 'fòô']
     * </code>
     *
     * @param mixed $value
     *
     * @return false|int|string
     *                          <p>Will return <b>FALSE</b> if the value can't be found.</p>
     *
     * @phpstan-param T $value
     * @phpstan-return false|TKey
     *
     * @psalm-mutation-free
     */
    public function searchIndex($value)
    {
        foreach ($this->getGenerator() as $keyFromArray => $valueFromArray) {
            if ($value === $valueFromArray) {
                return $keyFromArray;
            }
        }

        return false;
    }

    /**
     * Search for the value of the current array via $index.
     *
     * EXAMPLE: <code>
     * a(['fòô' => 'bàř'])->searchValue('fòô'); // Arrayy[0 => 'bàř']
     * </code>
     *
     * @param mixed $index
     *
     * @return static
     *                <p>(Immutable) Will return a empty Arrayy if the value wasn't found.</p>
     *
     * @phpstan-param TKey $index
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function searchValue($index): self
    {
        $this->generatorToArray();

        // init
        $return = [];

        if ($this->array === []) {
            return static::create(
                /* @phpstan-ignore-next-line argument.type */
                [],
                $this->iteratorClass,
                false
            );
        }

        // php cast "bool"-index into "int"-index
        /* @phpstan-ignore identical.alwaysFalse */
        if ((bool) $index === $index) {
            $index = (int) $index;
        }

        if ($this->offsetExists($index)) {
            $return = [$this->array[$index]];
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $return,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Set a value for the current array (optional using dot-notation).
     *
     * EXAMPLE: <code>
     * $arrayy = a(['Lars' => ['lastname' => 'Moelleken']]);
     * $arrayy->set('Lars.lastname', 'Müller'); // Arrayy['Lars', ['lastname' => 'Müller']]]
     * </code>
     *
     * @param string $key   <p>The key to set.</p>
     * @param mixed  $value <p>Its value.</p>
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-param  TKey $key
     * @phpstan-param  T $value
     * @phpstan-return static
     */
    public function set($key, $value): self
    {
        $this->internalSet($key, $value);

        return $this;
    }

    /**
     * Get a value from a array and set it if it was not.
     *
     * WARNING: this method only set the value, if the $key is not already set
     *
     * EXAMPLE: <code>
     * $arrayy = a([1 => 1, 2 => 2, 3 => 3]);
     * $arrayy->setAndGet(1, 4); // 1
     * $arrayy->setAndGet(0, 4); // 4
     * </code>
     *
     * @param mixed $key      <p>The key</p>
     * @param mixed $fallback <p>The default value to set if it isn't.</p>
     *
     * @return mixed
     *               <p>(Mutable)</p>
     *
     * @phpstan-param TKey $key
     * @phpstan-param T $fallback
     */
    public function setAndGet($key, $fallback = null)
    {
        $this->generatorToArray();

        // If the key doesn't exist, set it.
        if (!$this->has($key)) {
            $this->array = $this->set($key, $fallback)->toArray();
        }

        return $this->get($key);
    }

    /**
     * Shifts a specified value off the beginning of array.
     *
     * @return mixed|null
     *                    <p>(Mutable) A shifted element from the current array.</p>
     *
     * @phpstan-return T|null
     */
    public function shift()
    {
        $this->generatorToArray();

        return \array_shift($this->array);
    }

    /**
     * Shuffle the current array.
     *
     * EXAMPLE: <code>
     * a([1 => 'bar', 'foo' => 'foo'])->shuffle(); // e.g.: Arrayy[['foo' => 'foo', 1 => 'bar']]
     * </code>
     *
     * @param bool       $secure <p>using a CSPRNG | @see https://paragonie.com/b/JvICXzh_jhLyt4y3</p>
     * @param array|null $array  [optional]
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param  array<TKey,T> $array
     * @phpstan-return static
     */
    public function shuffle(bool $secure = false, ?array $array = null): self
    {
        if ($array === null) {
            $array = $this->toArray(false);
        }

        if ($secure !== true) {
            \shuffle($array);
        } else {
            $size = \count($array, \COUNT_NORMAL);
            $keys = \array_keys($array);
            for ($i = $size - 1; $i > 0; --$i) {
                try {
                    $r = \random_int(0, $i);
                } catch (\Exception $e) {
                    /** @noinspection RandomApiMigrationInspection - "random_int" is already in use */
                    $r = \mt_rand(0, $i);
                }
                if ($r !== $i) {
                    $temp = $array[$keys[$r]];
                    $array[$keys[$r]] = $array[$keys[$i]];
                    $array[$keys[$i]] = $temp;
                }
            }
        }

        foreach ($array as $key => $value) {
            // check if recursive is needed
            if (\is_array($value)) {
                /** @noinspection PhpSillyAssignmentInspection - hack for phpstan */
                /** @phpstan-var array<TKey,T> $value */
                $value = $value;

                $array[$key] = $this->shuffle($secure, $value);
            }
        }

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $array,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Count the values from the current array.
     *
     * alias: for "Arrayy->count()"
     *
     * @param int $mode
     *
     * @return int
     */
    public function size(int $mode = \COUNT_NORMAL): int
    {
        return $this->count($mode);
    }

    /**
     * Checks whether array has exactly $size items.
     *
     * @param int $size
     *
     * @return bool
     */
    public function sizeIs(int $size): bool
    {
        // init
        $itemsTempCount = 0;

        /** @noinspection PhpUnusedLocalVariableInspection */
        /** @noinspection PhpParameterByRefIsNotUsedAsReferenceInspection */
        foreach ($this->getGeneratorByReference() as &$value) {
            ++$itemsTempCount;
            if ($itemsTempCount > $size) {
                return false;
            }
        }

        return $itemsTempCount === $size;
    }

    /**
     * Checks whether array has between $fromSize to $toSize items. $toSize can be
     * smaller than $fromSize.
     *
     * @param int $fromSize
     * @param int $toSize
     *
     * @return bool
     */
    public function sizeIsBetween(int $fromSize, int $toSize): bool
    {
        if ($fromSize > $toSize) {
            $tmp = $toSize;
            $toSize = $fromSize;
            $fromSize = $tmp;
        }

        // init
        $itemsTempCount = 0;

        /** @noinspection PhpUnusedLocalVariableInspection */
        foreach ($this->getGenerator() as $value) {
            ++$itemsTempCount;
            if ($itemsTempCount > $toSize) {
                return false;
            }
        }

        return $fromSize < $itemsTempCount && $itemsTempCount < $toSize;
    }

    /**
     * Checks whether array has more than $size items.
     *
     * @param int $size
     *
     * @return bool
     */
    public function sizeIsGreaterThan(int $size): bool
    {
        // init
        $itemsTempCount = 0;

        /** @noinspection PhpUnusedLocalVariableInspection */
        foreach ($this->getGenerator() as $value) {
            ++$itemsTempCount;
            if ($itemsTempCount > $size) {
                return true;
            }
        }

        return $itemsTempCount > $size;
    }

    /**
     * Checks whether array has less than $size items.
     *
     * @param int $size
     *
     * @return bool
     */
    public function sizeIsLessThan(int $size): bool
    {
        // init
        $itemsTempCount = 0;

        /** @noinspection PhpUnusedLocalVariableInspection */
        foreach ($this->getGenerator() as $value) {
            ++$itemsTempCount;
            if ($itemsTempCount > $size) {
                return false;
            }
        }

        return $itemsTempCount < $size;
    }

    /**
     * Counts all elements in an array, or something in an object.
     *
     * <p>
     * For objects, if you have SPL installed, you can hook into count() by implementing interface {@see Countable}.
     * The interface has exactly one method, {@see Countable::count()}, which returns the return value for the count()
     * function. Please see the {@see Array} section of the manual for a detailed explanation of how arrays are
     * implemented and used in PHP.
     * </p>
     *
     * @return int
     *             <p>
     *             The number of elements in var, which is
     *             typically an array, since anything else will have one
     *             element.
     *             </p>
     *             <p>
     *             If var is not an array or an object with
     *             implemented Countable interface,
     *             1 will be returned.
     *             There is one exception, if var is &null;,
     *             0 will be returned.
     *             </p>
     *             <p>
     *             Caution: count may return 0 for a variable that isn't set,
     *             but it may also return 0 for a variable that has been initialized with an
     *             empty array. Use isset to test if a variable is set.
     *             </p>
     */
    public function sizeRecursive(): int
    {
        return \count($this->toArray(), \COUNT_RECURSIVE);
    }

    /**
     * Extract a slice of the array.
     *
     * @param int      $offset       <p>Slice begin index.</p>
     * @param int|null $length       <p>Length of the slice.</p>
     * @param bool     $preserveKeys <p>Whether array keys are preserved or no.</p>
     *
     * @return static
     *                <p>(Immutable) A slice of the original array with length $length.</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function slice(int $offset, ?int $length = null, bool $preserveKeys = false)
    {
        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            \array_slice(
                $this->toArray(),
                $offset,
                $length,
                $preserveKeys
            ),
            $this->iteratorClass,
            false
        );
    }

    /**
     * Sort the current array and optional you can keep the keys.
     *
     * EXAMPLE: <code>
     * a(3 => 'd', 2 => 'f', 0 => 'a')->sort(SORT_ASC, SORT_NATURAL, false); // Arrayy[0 => 'a', 1 => 'd', 2 => 'f']
     * </code>
     *
     * @param int|string $direction
     *                              <p>use <strong>SORT_ASC</strong> (default) or <strong>SORT_DESC</strong></p>
     * @param int        $strategy
     *                              <p>sort_flags => use e.g.: <strong>SORT_REGULAR</strong> (default) or
     *                              <strong>SORT_NATURAL</strong></p>
     * @param bool       $keepKeys
     *
     * @return static
     *                <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     */
    public function sort(
        $direction = \SORT_ASC,
        int $strategy = \SORT_REGULAR,
        bool $keepKeys = false
    ): self {
        $this->generatorToArray();

        return $this->sorting(
            $this->array,
            $direction,
            $strategy,
            $keepKeys
        );
    }

    /**
     * Sort the current array and optional you can keep the keys.
     *
     * @param int|string $direction <p>use <strong>SORT_ASC</strong> (default) or <strong>SORT_DESC</strong></p>
     * @param int        $strategy  <p>sort_flags => use e.g.: <strong>SORT_REGULAR</strong> (default) or
     *                              <strong>SORT_NATURAL</strong></p>
     * @param bool       $keepKeys
     *
     * @return static
     *                <p>(Immutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     */
    public function sortImmutable(
        $direction = \SORT_ASC,
        int $strategy = \SORT_REGULAR,
        bool $keepKeys = false
    ): self {
        $that = clone $this;

        $that->generatorToArray();

        return $that->sorting(
            $that->array,
            $direction,
            $strategy,
            $keepKeys
        );
    }

    /**
     * Sort the current array by key.
     *
     * EXAMPLE: <code>
     * a([1 => 2, 0 => 1])->sortKeys(\SORT_ASC); // Arrayy[0 => 1, 1 => 2]
     * </code>
     *
     * @see http://php.net/manual/en/function.ksort.php
     * @see http://php.net/manual/en/function.krsort.php
     *
     * @param int|string $direction <p>use <strong>SORT_ASC</strong> (default) or <strong>SORT_DESC</strong></p>
     * @param int        $strategy  <p>use e.g.: <strong>SORT_REGULAR</strong> (default) or
     *                              <strong>SORT_NATURAL</strong></p>
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     */
    public function sortKeys(
        $direction = \SORT_ASC,
        int $strategy = \SORT_REGULAR
    ): self {
        $this->generatorToArray();

        $this->sorterKeys($this->array, $direction, $strategy);

        return $this;
    }

    /**
     * Sort the current array by key.
     *
     * @see          http://php.net/manual/en/function.ksort.php
     * @see          http://php.net/manual/en/function.krsort.php
     *
     * @param int|string $direction <p>use <strong>SORT_ASC</strong> (default) or <strong>SORT_DESC</strong></p>
     * @param int        $strategy  <p>use e.g.: <strong>SORT_REGULAR</strong> (default) or
     *                              <strong>SORT_NATURAL</strong></p>
     *
     * @return $this
     *               <p>(Immutable) Return this Arrayy object.</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function sortKeysImmutable(
        $direction = \SORT_ASC,
        int $strategy = \SORT_REGULAR
    ): self {
        $that = clone $this;

        /**
         * @psalm-suppress ImpureMethodCall - object is already cloned
         */
        $that->sortKeys($direction, $strategy);

        return $that;
    }

    /**
     * Sort the current array by value.
     *
     * EXAMPLE: <code>
     * a(3 => 'd', 2 => 'f', 0 => 'a')->sortValueKeepIndex(SORT_ASC, SORT_REGULAR); // Arrayy[0 => 'a', 3 => 'd', 2 => 'f']
     * </code>
     *
     * @param int|string $direction <p>use <strong>SORT_ASC</strong> (default) or <strong>SORT_DESC</strong></p>
     * @param int        $strategy  <p>use e.g.: <strong>SORT_REGULAR</strong> (default) or
     *                              <strong>SORT_NATURAL</strong></p>
     *
     * @return static
     *                <p>(Mutable)</p>
     *
     * @phpstan-return static
     */
    public function sortValueKeepIndex(
        $direction = \SORT_ASC,
        int $strategy = \SORT_REGULAR
    ): self {
        return $this->sort($direction, $strategy, true);
    }

    /**
     * Sort the current array by value.
     *
     * EXAMPLE: <code>
     * a(3 => 'd', 2 => 'f', 0 => 'a')->sortValueNewIndex(SORT_ASC, SORT_NATURAL); // Arrayy[0 => 'a', 1 => 'd', 2 => 'f']
     * </code>
     *
     * @param int|string $direction <p>use <strong>SORT_ASC</strong> (default) or <strong>SORT_DESC</strong></p>
     * @param int        $strategy  <p>use e.g.: <strong>SORT_REGULAR</strong> (default) or
     *                              <strong>SORT_NATURAL</strong></p>
     *
     * @return static
     *                <p>(Mutable)</p>
     *
     * @phpstan-return static
     */
    public function sortValueNewIndex($direction = \SORT_ASC, int $strategy = \SORT_REGULAR): self
    {
        return $this->sort($direction, $strategy, false);
    }

    /**
     * Sort a array by value or by a closure.
     *
     * - If the sorter is null, the array is sorted naturally.
     * - Associative (string) keys will be maintained, but numeric keys will be re-indexed.
     *
     * EXAMPLE: <code>
     * $testArray = range(1, 5);
     * $under = a($testArray)->sorter(
     *     function ($value) {
     *         return $value % 2 === 0;
     *     }
     * );
     * var_dump($under); // Arrayy[1, 3, 5, 2, 4]
     * </code>
     *
     * @param callable|mixed|null $sorter
     * @param int|string          $direction <p>use <strong>SORT_ASC</strong> (default) or
     *                                       <strong>SORT_DESC</strong></p>
     * @param int                 $strategy  <p>use e.g.: <strong>SORT_REGULAR</strong> (default) or
     *                                       <strong>SORT_NATURAL</strong></p>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @pslam-param callable|T|null $sorter
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function sorter($sorter = null, $direction = \SORT_ASC, int $strategy = \SORT_REGULAR): self
    {
        $array = $this->toArray();
        $direction = $this->getDirection($direction);

        // Transform all values into their results.
        if ($sorter) {
            $arrayy = static::create(
                /* @phpstan-ignore-next-line argument.type */
                $array,
                $this->iteratorClass,
                false
            );

            /**
             * @psalm-suppress MissingClosureReturnType
             * @psalm-suppress MissingClosureParamType
             */
            $results = $arrayy->each(
                static function ($value) use ($sorter) {
                    if (\is_callable($sorter) === true) {
                        return $sorter($value);
                    }

                    return $sorter === $value;
                }
            );

            $results = $results->toArray();
        } else {
            $results = $array;
        }

        // Sort by the results and replace by original values
        \array_multisort($results, $direction, $strategy, $array);

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $array,
            $this->iteratorClass,
            false
        );
    }

    /**
     * @param int      $offset
     * @param int|null $length
     * @param array    $replacement
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-param  array<T> $replacement
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function splice(int $offset, ?int $length = null, $replacement = []): self
    {
        $tmpArray = $this->toArray();

        \array_splice(
            $tmpArray,
            $offset,
            $length ?? $this->count(),
            $replacement
        );

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $tmpArray,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Split an array in the given amount of pieces.
     *
     * EXAMPLE: <code>
     * a(['a' => 1, 'b' => 2])->split(2, true); // Arrayy[['a' => 1], ['b' => 2]]
     * </code>
     *
     * @param int  $numberOfPieces
     * @param bool $keepKeys
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function split(int $numberOfPieces = 2, bool $keepKeys = false): self
    {
        if ($keepKeys) {
            $generator = function () use ($numberOfPieces) {
                $carry = [];
                $i = 1;
                foreach ($this->getGenerator() as $key => $value) {
                    $carry[$key] = $value;

                    if ($i % $numberOfPieces !== 0) {
                        ++$i;

                        continue;
                    }

                    yield $carry;

                    $carry = [];
                    $i = 1;
                }

                if ($carry !== []) {
                    yield $carry;
                }
            };
        } else {
            $generator = function () use ($numberOfPieces) {
                $carry = [];
                $i = 1;
                foreach ($this->getGenerator() as $value) {
                    $carry[] = $value;

                    if ($i % $numberOfPieces !== 0) {
                        ++$i;

                        continue;
                    }

                    yield $carry;

                    $carry = [];
                    $i = 1;
                }

                if ($carry !== []) {
                    yield $carry;
                }
            };
        }

        return static::create(
            $generator,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Strip all empty items from the current array.
     *
     * EXAMPLE: <code>
     * a(['a' => 1, 'b' => ''])->stripEmpty(); // Arrayy[['a' => 1]]
     * </code>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function stripEmpty(): self
    {
        $generator = function () {
            foreach ($this->getGenerator() as $key => $item) {
                if ($item === null) {
                    continue;
                }

                if ((bool) \trim((string) $item)) {
                    yield $key => $item;
                }
            }
        };

        return static::create(
            $generator(),
            $this->iteratorClass,
            false
        );
    }

    /**
     * Swap two values between positions by key.
     *
     * EXAMPLE: <code>
     * a(['a' => 1, 'b' => ''])->swap('a', 'b'); // Arrayy[['a' => '', 'b' => 1]]
     * </code>
     *
     * @param int|string $swapA <p>a key in the array</p>
     * @param int|string $swapB <p>a key in the array</p>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function swap($swapA, $swapB): self
    {
        $array = $this->toArray();

        list($array[$swapA], $array[$swapB]) = [$array[$swapB], $array[$swapA]];

        return static::create(
            /* @phpstan-ignore-next-line argument.type */
            $array,
            $this->iteratorClass,
            false
        );
    }

    /**
     * Get the current array from the "Arrayy"-object.
     * alias for "getArray()"
     *
     * @param bool $convertAllArrayyElements <p>
     *                                       Convert all Child-"Arrayy" objects also to arrays.
     *                                       </p>
     * @param bool $preserveKeys             <p>
     *                                       e.g.: A generator maybe return the same key more than once,
     *                                       so maybe you will ignore the keys.
     *                                       </p>
     *
     * @return array
     *
     * @phpstan-return ($preserveKeys is true ? array<TKey,T> : T[])
     * @psalm-mutation-free
     */
    public function toArray(
        bool $convertAllArrayyElements = false,
        bool $preserveKeys = true
    ): array {
        if ($convertAllArrayyElements) {
            // init
            $array = [];

            foreach ($this->getGenerator() as $key => $value) {
                if ($value instanceof self) {
                    $value = $value->toArray(
                        $convertAllArrayyElements,
                        $preserveKeys
                    );
                }

                if ($preserveKeys) {
                    $array[$key] = $value;
                } else {
                    $array[] = $value;
                }
            }

            /* @phpstan-ignore return.type */
            return $array;
        }

        return \iterator_to_array($this->getGenerator(), $preserveKeys);
    }

    /**
     * Get the current array from the "Arrayy"-object as list.
     *
     * @param bool $convertAllArrayyElements <p>
     *                                       Convert all Child-"Arrayy" objects also to arrays.
     *                                       </p>
     *
     * @return array
     *
     * @phpstan-return list<T>
     * @psalm-mutation-free
     */
    public function toList(bool $convertAllArrayyElements = false): array
    {
        /** @var list<T> - currently phpstan can't return different types depending on the phpdocs params */
        return $this->toArray(
            $convertAllArrayyElements,
            false
        );
    }

    /**
     * Convert the current array to JSON.
     *
     * EXAMPLE: <code>
     * a(['bar', ['foo']])->toJson(); // '["bar",{"1":"foo"}]'
     * </code>
     *
     * @param int $options [optional] <p>e.g. JSON_PRETTY_PRINT</p>
     * @param int $depth   [optional] <p>Set the maximum depth. Must be greater than zero.</p>
     *
     * @return string
     */
    public function toJson(int $options = 0, int $depth = 512): string
    {
        if ($depth < 1) {
            $depth = 1;
        }

        $return = \json_encode($this->toArray(), $options, $depth);
        if ($return === false) {
            return '';
        }

        return $return;
    }

    /**
     * @param string[]|null $items  [optional]
     * @param string[]      $helper [optional]
     *
     * @return static|static[]
     *
     * @phpstan-return static
     */
    public function toPermutation(?array $items = null, array $helper = []): self
    {
        // init
        $return = [];

        if ($items === null) {
            $items = $this->toArray();
        }

        if (empty($items)) {
            $return[] = $helper;
        } else {
            for ($i = \count($items) - 1; $i >= 0; --$i) {
                $new_items = $items;
                $new_helper = $helper;
                list($tmp_helper) = \array_splice($new_items, $i, 1);
                /** @noinspection PhpSillyAssignmentInspection */
                /** @var string[] $new_items */
                $new_items = $new_items;
                \array_unshift($new_helper, $tmp_helper);
                $return = \array_merge(
                    $return,
                    $this->toPermutation($new_items, $new_helper)->toArray()
                );
            }
        }

        /** @var static $return  - help for phpstan */
        $return = static::create(
            /* @phpstan-ignore-next-line argument.type */
            $return,
            $this->iteratorClass,
            false
        );

        return $return;
    }

    /**
     * Implodes array to a string with specified separator.
     *
     * @param string $separator [optional] <p>The element's separator.</p>
     *
     * @return string
     *                <p>The string representation of array, separated by ",".</p>
     */
    public function toString(string $separator = ','): string
    {
        return $this->implode($separator);
    }

    /**
     * Return a duplicate free copy of the current array.
     *
     * EXAMPLE: <code>
     * a([2 => 1, 3 => 2, 4 => 2])->uniqueNewIndex(); // Arrayy[1, 2]
     * </code>
     *
     * @return $this
     *               <p>(Mutable)</p>
     *
     * @phpstan-return static
     */
    public function uniqueNewIndex(): self
    {
        // INFO: \array_unique() can't handle e.g. "stdClass"-values in an array

        $this->array = $this->reduce(
            static function ($resultArray, $value, $key) {
                if (!\in_array($value, $resultArray, true)) {
                    $resultArray[] = $value;
                }

                return $resultArray;
            },
            []
        )->toArray();
        $this->generator = null;

        return $this;
    }

    /**
     * Return a duplicate free copy of the current array. (with the old keys)
     *
     * EXAMPLE: <code>
     * a([2 => 1, 3 => 2, 4 => 2])->uniqueNewIndex(); // Arrayy[2 => 1, 3 => 2]
     * </code>
     *
     * @return $this
     *               <p>(Mutable)</p>
     *
     * @phpstan-return static
     */
    public function uniqueKeepIndex(): self
    {
        // INFO: \array_unique() can't handle e.g. "stdClass"-values in an array

        // init
        $array = $this->toArray();

        /**
         * @psalm-suppress MissingClosureReturnType
         * @psalm-suppress MissingClosureParamType
         */
        $this->array = \array_reduce(
            \array_keys($array),
            static function ($resultArray, $key) use ($array) {
                if (!\in_array($array[$key], $resultArray, true)) {
                    $resultArray[$key] = $array[$key];
                }

                return $resultArray;
            },
            []
        );
        $this->generator = null;

        return $this;
    }

    /**
     * alias: for "Arrayy->uniqueNewIndex()"
     *
     * @return static
     *                <p>(Mutable) Return this Arrayy object, with the appended values.</p>
     *
     * @see          Arrayy::unique()
     *
     * @phpstan-return static
     */
    public function unique(): self
    {
        return $this->uniqueNewIndex();
    }

    /**
     * Prepends one or more values to the beginning of array at once.
     *
     * @param mixed ...$args
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object, with prepended elements to the beginning of array.</p>
     *
     * @phpstan-param  array<TKey,T> ...$args
     * @phpstan-return static
     */
    public function unshift(...$args): self
    {
        $this->generatorToArray();

        if (
            $this->checkPropertyTypes
            &&
            $this->properties !== []
        ) {
            foreach ($args as $key => $value) {
                $this->checkType($key, $value);
            }
        }

        \array_unshift($this->array, ...$args); // @phpstan-ignore assign.propertyType

        return $this;
    }

    /**
     * Tests whether the given closure return something valid for all elements of this array.
     *
     * @param \Closure $closure the predicate
     *
     * @return bool
     *              <p>TRUE, if the predicate yields TRUE for all elements, FALSE otherwise.</p>
     *
     * @phpstan-param \Closure(T,TKey):bool $closure
     */
    public function validate(\Closure $closure): bool
    {
        foreach ($this->getGenerator() as $key => $value) {
            if (!$closure($value, $key)) {
                return false;
            }
        }

        return true;
    }

    /**
     * Get all values from a array.
     *
     * EXAMPLE: <code>
     * $arrayy = a([1 => 'foo', 2 => 'foo2', 3 => 'bar']);
     * $arrayyTmp->values(); // Arrayy[0 => 'foo', 1 => 'foo2', 2 => 'bar']
     * </code>
     *
     * @return static
     *                <p>(Immutable)</p>
     *
     * @phpstan-return static
     * @psalm-mutation-free
     */
    public function values(): self
    {
        return static::create(
            function () {
                foreach ($this->getGenerator() as $value) {
                    yield $value;
                }
            },
            $this->iteratorClass,
            false
        );
    }

    /**
     * Apply the given function to every element in the array, discarding the results.
     *
     * EXAMPLE: <code>
     * $callable = function (&$value, $key) {
     *     $value = $key;
     * };
     * $arrayy = a([1, 2, 3]);
     * $arrayy->walk($callable); // Arrayy[0, 1, 2]
     * </code>
     *
     * @param callable $callable
     * @param bool     $recursive
     *                            [optional] <p>Whether array will be walked recursively or no</p>
     * @param mixed    $userData
     *                            [optional] <p>
     *                            If the optional $userData parameter is supplied,
     *                            it will be passed as the third parameter to the $callable.
     *                            </p>
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object, with modified elements.</p>
     *
     * @template TExtra
     *              <p>The extra input value type.</p>
     *
     * @phostan-param TExtra $userData
     * @phpstan-param  callable(T,TKey,?TExtra):void $callable
     * @phpstan-return static
     */
    public function walk(
        $callable,
        bool $recursive = false,
        $userData = self::ARRAYY_HELPER_WALK
    ): self {
        $this->generatorToArray();

        if ($this->array !== []) {
            if ($recursive === true) {
                if ($userData !== self::ARRAYY_HELPER_WALK) {
                    \array_walk_recursive($this->array, $callable, $userData);
                } else {
                    \array_walk_recursive($this->array, $callable);
                }
            } else {
                if ($userData !== self::ARRAYY_HELPER_WALK) {
                    \array_walk($this->array, $callable, $userData);
                } else {
                    /* @phpstan-ignore argument.type */
                    \array_walk($this->array, $callable);
                }
            }
        }

        return $this;
    }

    /**
     * Returns a collection of matching items.
     *
     * @param string $keyOrPropertyOrMethod
     *                                      <p>The property or method to evaluate.</p>
     * @param mixed  $value
     *                                      <p>The value to match.</p>
     *
     * @throws \InvalidArgumentException if property or method is not defined
     *
     * @return static
     *
     * @phpstan-return static
     */
    public function where(string $keyOrPropertyOrMethod, $value): self
    {
        return $this->filter(
            function ($item) use ($keyOrPropertyOrMethod, $value) {
                $accessorValue = $this->extractValue(
                    /* @phpstan-ignore-next-line argument.type (filter() does not retain the item type in this callback) */
                    $item,
                    $keyOrPropertyOrMethod
                );

                return $accessorValue === $value;
            }
        );
    }

    /**
     * Convert an array into an object.
     *
     * @param array $array
     *
     * @return \stdClass
     *
     * @phpstan-param array<int|string,mixed> $array
     */
    final protected static function arrayToObject(array $array = []): \stdClass
    {
        // init
        $object = new \stdClass();

        if (\count($array, \COUNT_NORMAL) <= 0) {
            return $object;
        }

        foreach ($array as $name => $value) {
            if (\is_array($value)) {
                $object->{$name} = static::arrayToObject($value);
            } else {
                $object->{$name} = $value;
            }
        }

        return $object;
    }

    /**
     * @param array|\Generator|null $input         <p>
     *                                             An array containing keys to return.
     *                                             </p>
     * @param mixed|null            $search_values [optional] <p>
     *                                             If specified, then only keys containing these values are returned.
     *                                             </p>
     * @param bool                  $strict        [optional] <p>
     *                                             Determines if strict comparison (===) should be used during the
     *                                             search.
     *                                             </p>
     *
     * @return array
     *               <p>An array of all the keys in input.</p>
     *
     * @template TInput
     *
     * @phpstan-param  array<array-key,TInput>|\Generator<array-key,TInput>|null $input
     * @phpstan-param T|T[]|null $search_values
     * @phpstan-return array<int, TKey>
     *
     * @psalm-mutation-free
     */
    protected function array_keys_recursive(
        $input = null,
        $search_values = null,
        bool $strict = true
    ): array {
        // init
        $keys = [];
        $keysTmp = [];

        if ($input === null) {
            $input = $this->getGenerator();
        }

        if ($search_values === null) {
            foreach ($input as $key => $value) {
                $keys[] = $key;

                // check if recursive is needed
                if (\is_array($value)) {
                    $keysTmp[] = $this->array_keys_recursive($value);
                }
            }
        } else {
            $is_array_tmp = \is_array($search_values);

            foreach ($input as $key => $value) {
                if (
                    (
                        $is_array_tmp === false
                        &&
                        $strict === true
                        &&
                        $search_values === $value
                    )
                    ||
                    (
                        $is_array_tmp === false
                        &&
                        $strict === false
                        &&
                        $search_values == $value
                    )
                    ||
                    (
                        $is_array_tmp === true
                        &&
                        \in_array($value, $search_values, $strict)
                    )
                ) {
                    $keys[] = $key;
                }

                // check if recursive is needed
                if (\is_array($value)) {
                    $keysTmp[] = $this->array_keys_recursive($value);
                }
            }
        }

        return $keysTmp === [] ? $keys : \array_merge($keys, ...$keysTmp);
    }

    /**
     * @param string     $path
     * @param callable   $callable
     * @param array|null $currentOffset
     *
     * @return void
     *
     * @phpstan-param array<array-key,mixed>|null $currentOffset
     * @psalm-mutation-free
     */
    protected function callAtPath($path, $callable, &$currentOffset = null)
    {
        $this->generatorToArray();

        if ($currentOffset === null) {
            $currentOffset = &$this->array;
        }

        $explodedPath = \explode($this->pathSeparator, $path);

        $nextPath = \array_shift($explodedPath);
        if (!isset($currentOffset[$nextPath])) {
            return;
        }

        if ($explodedPath !== []) {
            if (!\is_array($currentOffset[$nextPath])) {
                return;
            }

            $nestedOffset = &$currentOffset[$nextPath];
            $this->callAtPath(
                \implode($this->pathSeparator, $explodedPath),
                $callable,
                $nestedOffset
            );
        } else {
            $callable($currentOffset[$nextPath]);
        }
    }

    /**
     * Extracts the value of the given property or method from the object.
     *
     * @param array|object $object
     *                                         <p>The object to extract the value from.</p>
     * @param string    $keyOrPropertyOrMethod
     *                                         <p>The property or method for which the
     *                                         value should be extracted.</p>
     *
     * @throws \InvalidArgumentException if the method or property is not defined
     *
     * @return mixed
     *               <p>The value extracted from the specified property or method.</p>
     *
     * @phpstan-param array<array-key,mixed>|object $object
     */
    final protected function extractValue($object, string $keyOrPropertyOrMethod)
    {
        if (\is_array($object)) {
            if (\array_key_exists($keyOrPropertyOrMethod, $object)) {
                return $object[$keyOrPropertyOrMethod];
            }
        } elseif ($object instanceof self && isset($object[$keyOrPropertyOrMethod])) {
            $return = $object->get($keyOrPropertyOrMethod);

            if ($return instanceof self) {
                return $return->toArray();
            }

            return $return;
        }

        if (\is_object($object) && \property_exists($object, $keyOrPropertyOrMethod)) {
            return $object->{$keyOrPropertyOrMethod};
        }

        if (\is_object($object) && \method_exists($object, $keyOrPropertyOrMethod)) {
            return $object->{$keyOrPropertyOrMethod}();
        }

        throw new \InvalidArgumentException(\sprintf('array-key & property & method "%s" not defined in %s', $keyOrPropertyOrMethod, \gettype($object)));
    }

    /**
     * create a fallback for array
     *
     * 1. use the current array, if it's a array
     * 2. fallback to empty array, if there is nothing
     * 3. call "getArray()" on object, if there is a "Arrayy"-object
     * 4. call "createFromObject()" on object, if there is a "\Traversable"-object
     * 5. call "__toArray()" on object, if the method exists
     * 6. cast a string or object with "__toString()" into an array
     * 7. throw a "InvalidArgumentException"-Exception
     *
     * @param mixed $data
     *
     * @throws \InvalidArgumentException
     *
     * @return array
     *
     * @phpstan-return array<mixed>|array<TKey,T>
     */
    protected function fallbackForArray(&$data): array
    {
        $data = $this->internalGetArray($data);

        if ($data === null) {
            throw new \InvalidArgumentException('Passed value should be a array');
        }

        return $data;
    }

    /**
     * @param bool $preserveKeys <p>
     *                           e.g.: A generator maybe return the same key more than once,
     *                           so maybe you will ignore the keys.
     *                           </p>
     *
     * @return bool
     *
     * @noinspection ReturnTypeCanBeDeclaredInspection
     * @psalm-mutation-free :/
     */
    protected function generatorToArray(bool $preserveKeys = true)
    {
        if ($this->generator) {
            $this->array = $this->toArray(false, $preserveKeys);
            $this->generator = null;

            return true;
        }

        return false;
    }

    /**
     * Get correct PHP constant for direction.
     *
     * @param int|string $direction
     *
     * @return int
     * @psalm-mutation-free
     */
    protected function getDirection($direction): int
    {
        if ((string) $direction === $direction) {
            $direction = \strtolower($direction);

            if ($direction === 'desc') {
                $direction = \SORT_DESC;
            } else {
                $direction = \SORT_ASC;
            }
        }

        if (
            $direction !== \SORT_DESC
            &&
            $direction !== \SORT_ASC
        ) {
            $direction = \SORT_ASC;
        }

        return $direction;
    }

    /**
     * @return TypeCheckInterface[]
     *
     * @noinspection ReturnTypeCanBeDeclaredInspection
     */
    protected function getPropertiesFromPhpDoc()
    {
        static $PROPERTY_CACHE = [];
        static $OPTIONAL_PROPERTY_CACHE = [];
        $cacheKey = 'Class::' . static::class;

        if (isset($PROPERTY_CACHE[$cacheKey])) {
            $this->optionalProperties = $OPTIONAL_PROPERTY_CACHE[$cacheKey] ?? [];

            return $PROPERTY_CACHE[$cacheKey];
        }

        $properties = $this->getPropertiesFromNativeDefinitions();
        $optionalProperties = [];
        $phpDocPropertyAnnotationStyle = null;

        $reflector = new \ReflectionClass($this);
        $factory = \phpDocumentor\Reflection\DocBlockFactory::createInstance();
        $docComment = $reflector->getDocComment();
        if ($docComment) {
            $docblock = $factory->create($docComment);
            $this->addPropertiesFromDocBlock($docblock, $properties, $optionalProperties, $phpDocPropertyAnnotationStyle);
        }

        /** @noinspection PhpAssignmentInConditionInspection */
        while ($reflector = $reflector->getParentClass()) {
            $docComment = $reflector->getDocComment();
            if ($docComment) {
                $docblock = $factory->create($docComment);
                $this->addPropertiesFromDocBlock($docblock, $properties, $optionalProperties, $phpDocPropertyAnnotationStyle);
            }
        }

        $this->optionalProperties = $optionalProperties;
        $OPTIONAL_PROPERTY_CACHE[$cacheKey] = $optionalProperties;

        return $PROPERTY_CACHE[$cacheKey] = $properties;
    }

    /**
     * Merge property definitions from a docblock into the collected property map.
     *
     * @param \phpDocumentor\Reflection\DocBlock $docblock
     * @param TypeCheckInterface[]               $properties
     * @param array<string, true>                $optionalProperties
     * @param 'array-shape'|'property'|null      $phpDocPropertyAnnotationStyle
     *
     * @return void
     */
    private function addPropertiesFromDocBlock($docblock, array &$properties, array &$optionalProperties, ?string &$phpDocPropertyAnnotationStyle): void
    {
        $propertyTags = $docblock->getTagsByName('property');
        $arrayShapeItems = $this->getArrayShapeItemsFromDocBlock($docblock);

        if ($propertyTags !== [] && $arrayShapeItems !== []) {
            throw new \TypeError('Use either @property tags or array-shape annotations for Arrayy property definitions, not both.');
        }

        $currentPhpDocPropertyAnnotationStyle = null;
        if ($propertyTags !== []) {
            $currentPhpDocPropertyAnnotationStyle = 'property';
        } elseif ($arrayShapeItems !== []) {
            $currentPhpDocPropertyAnnotationStyle = 'array-shape';
        }

        if (
            $currentPhpDocPropertyAnnotationStyle !== null
            &&
            $phpDocPropertyAnnotationStyle !== null
            &&
            $phpDocPropertyAnnotationStyle !== $currentPhpDocPropertyAnnotationStyle
        ) {
            throw new \TypeError('Use either @property tags or array-shape annotations for Arrayy property definitions, not both.');
        }

        if ($currentPhpDocPropertyAnnotationStyle !== null) {
            $phpDocPropertyAnnotationStyle = $currentPhpDocPropertyAnnotationStyle;
        }

        /** @var \phpDocumentor\Reflection\DocBlock\Tags\Property $tag */
        foreach ($propertyTags as $tag) {
            $typeName = $tag->getVariableName();
            /** @var string|null $typeName */
            if (
                $typeName !== null
                &&
                isset($properties[$typeName]) === false
            ) {
                $typeCheckPhpDoc = TypeCheckPhpDoc::fromPhpDocumentorProperty($tag, $typeName);
                if ($typeCheckPhpDoc !== null) {
                    $properties[$typeName] = $typeCheckPhpDoc;
                    unset($optionalProperties[$typeName]);
                }
            }
        }

        foreach ($arrayShapeItems as $item) {
            $typeName = (string) $item->getKey();
            if ($typeName === '') {
                continue;
            }

            $typeName = \trim($typeName, '\'"');
            if (isset($properties[$typeName])) {
                continue;
            }

            $typeCheckPhpDoc = TypeCheckPhpDoc::fromDocTypeObject($typeName, $item->getValue());
            $properties[$typeName] = $typeCheckPhpDoc;
            if ($item->isOptional()) {
                $optionalProperties[$typeName] = true;
            }
        }
    }

    /**
     * Extract array-shape items from supported @template and @extends annotations.
     *
     * @param \phpDocumentor\Reflection\DocBlock $docblock
     *
     * @return \phpDocumentor\Reflection\PseudoTypes\ArrayShapeItem[]
     */
    private function getArrayShapeItemsFromDocBlock($docblock): array
    {
        if (!\class_exists('\phpDocumentor\Reflection\PseudoTypes\ArrayShape')) {
            return [];
        }

        $items = [];
        foreach ($docblock->getTagsByName('template') as $tag) {
            if (
                $tag instanceof \phpDocumentor\Reflection\DocBlock\Tags\Template
                &&
                $tag->getTemplateName() === 'T'
                &&
                $tag->getBound() instanceof \phpDocumentor\Reflection\PseudoTypes\ArrayShape
            ) {
                foreach ($tag->getBound()->getItems() as $item) {
                    $items[] = $item;
                }
            }
        }

        foreach ($docblock->getTagsByName('extends') as $tag) {
            if (!$tag instanceof \phpDocumentor\Reflection\DocBlock\Tags\Extends_) {
                continue;
            }

            $type = $tag->getType();
            if (
                !$type instanceof \phpDocumentor\Reflection\PseudoTypes\Generic
                ||
                !$this->isArrayyGenericTarget((string) $type->getFqsen())
            ) {
                continue;
            }

            foreach ($type->getTypes() as $genericType) {
                if ($genericType instanceof \phpDocumentor\Reflection\PseudoTypes\ArrayShape) {
                    foreach ($genericType->getItems() as $item) {
                        $items[] = $item;
                    }
                }
            }
        }

        return $items;
    }

    /**
     * Check whether a generic annotation target is Arrayy, ArrayyStrict, or an Arrayy subclass.
     *
     * @param string $fqcn
     *
     * @return bool
     */
    private function isArrayyGenericTarget(string $fqcn): bool
    {
        $fqcn = \ltrim($fqcn, '\\');
        if ($fqcn === '') {
            return false;
        }

        if (\in_array($fqcn, [self::class, ArrayyStrict::class], true)) {
            return true;
        }

        return \class_exists($fqcn) && \is_a($fqcn, self::class, true);
    }

    /**
     * @return TypeCheckInterface[]
     */
    protected function getPropertiesFromNativeDefinitions(): array
    {
        $properties = [];
        $reflector = new \ReflectionClass($this);
        $reservedProperties = self::getReservedPropertyNames();

        do {
            if ($reflector->getName() === self::class) {
                break;
            }

            foreach ($reflector->getProperties() as $property) {
                if (
                    $property->getDeclaringClass()->getName() !== $reflector->getName()
                    ||
                    $property->isStatic()
                    ||
                    isset($reservedProperties[$property->getName()])
                    ||
                    isset($properties[$property->getName()])
                ) {
                    continue;
                }

                $properties[$property->getName()] = TypeCheckPhpDoc::fromReflectionProperty($property);
            }
        } while ($reflector = $reflector->getParentClass());

        return $properties;
    }

    /**
     * @return array<string, true>
     */
    private static function getReservedPropertyNames(): array
    {
        static $reservedProperties = null;

        if ($reservedProperties !== null) {
            return $reservedProperties;
        }

        $reservedProperties = [];
        $reflector = new \ReflectionClass(self::class);
        foreach ($reflector->getProperties() as $property) {
            if ($property->getDeclaringClass()->getName() !== self::class) {
                continue;
            }

            $reservedProperties[$property->getName()] = true;
        }

        return $reservedProperties;
    }

    /**
     * @param string $glue
     * @param mixed  $pieces
     * @param bool   $useKeys
     *
     * @return string
     *
     * @phpstan-param scalar|object|self<TKey|T>|array<TKey,T>|array<T> $pieces
     * @psalm-mutation-free
     */
    protected function implode_recursive(
        $glue = '',
        $pieces = [],
        bool $useKeys = false
    ): string {
        if ($pieces instanceof self) {
            $pieces = $pieces->toArray();
        }

        if (\is_array($pieces)) {
            /** @noinspection PhpSillyAssignmentInspection - hack for phpstan */
            /** @phpstan-var array<TKey,T> $pieces */
            $pieces = $pieces;

            $pieces_count = \count($pieces, \COUNT_NORMAL);
            $pieces_count_not_zero = $pieces_count > 0;

            return \implode(
                $glue,
                \array_map(
                    [$this, 'implode_recursive'],
                    \array_fill(0, ($pieces_count_not_zero ? $pieces_count : 1), $glue),
                    ($useKeys === true && $pieces_count_not_zero ? $this->array_keys_recursive($pieces) : $pieces)
                )
            );
        }

        if (
            \is_scalar($pieces) === true
            ||
            $pieces instanceof \Stringable
        ) {
            return (string) $pieces;
        }

        return '';
    }

    /**
     * @param mixed                 $needle   <p>
     *                                        The searched value.
     *                                        </p>
     *                                        <p>
     *                                        If needle is a string, the comparison is done
     *                                        in a case-sensitive manner.
     *                                        </p>
     * @param array|\Generator|null $haystack <p>
     *                                        The array.
     *                                        </p>
     * @param bool                  $strict   [optional] <p>
     *                                        If the third parameter strict is set to true
     *                                        then the in_array function will also check the
     *                                        types of the
     *                                        needle in the haystack.
     *                                        </p>
     *
     * @return bool
     *              <p>true if needle is found in the array, false otherwise</p>
     *
     * @phpstan-param array<array-key, mixed>|array<TKey,T>|\Generator<TKey,T>|null $haystack
     *
     * @psalm-mutation-free
     */
    protected function in_array_recursive($needle, $haystack = null, $strict = true): bool
    {
        if ($haystack === null) {
            $haystack = $this->getGenerator();
        }

        foreach ($haystack as $item) {
            if (\is_array($item)) {
                $returnTmp = $this->in_array_recursive($needle, $item, $strict);
            } else {
                /** @noinspection NestedPositiveIfStatementsInspection */
                if ($strict === true) {
                    $returnTmp = $item === $needle;
                } else {
                    $returnTmp = $item == $needle;
                }
            }

            if ($returnTmp === true) {
                return true;
            }
        }

        return false;
    }

    /**
     * @param mixed $data
     *
     * @return array<mixed>|null
     */
    protected function internalGetArray(&$data)
    {
        if (\is_array($data)) {
            return $data;
        }

        if (!$data) {
            return [];
        }

        if (\is_object($data) === true) {
            if ($data instanceof \ArrayObject) {
                return $data->getArrayCopy();
            }

            if ($data instanceof \Generator) {
                return static::createFromGeneratorImmutable($data)->toArray();
            }

            if ($data instanceof \Traversable) {
                return static::createFromObject($data)->toArray();
            }

            if ($data instanceof \JsonSerializable) {
                return (array) $data->jsonSerialize();
            }

            if (\method_exists($data, '__toArray')) {
                return (array) $data->__toArray();
            }

            if (\method_exists($data, '__toString')) {
                return [(string) $data];
            }
        }

        if (\is_callable($data)) {
            /**
             * @psalm-suppress InvalidPropertyAssignmentValue - why?
             */
            $this->generator = new ArrayyRewindableGenerator($data);

            return [];
        }

        if (\is_scalar($data)) {
            return [$data];
        }

        return null;
    }

    /**
     * Internal mechanics of remove method.
     *
     * @param float|int|string $key
     *
     * @return bool
     */
    protected function internalRemove($key): bool
    {
        $this->generatorToArray();

        if (\is_float($key)) {
            $key = (int) $key;
        }

        if (
            $this->pathSeparator
            &&
            (string) $key === $key
            &&
            \strpos($key, $this->pathSeparator) !== false
        ) {
            $path = \explode($this->pathSeparator, (string) $key);
            // crawl though the keys
            while (\count($path, \COUNT_NORMAL) > 1) {
                $key = \array_shift($path);

                if (!$this->has($key)) {
                    return false;
                }

                $this->array = &$this->array[$key];
            }

            $key = \array_shift($path);
        }

        unset($this->array[$key]);

        return true;
    }

    /**
     * Internal mechanic of set method.
     *
     * @param int|string|null $key
     * @param mixed           $value
     * @param bool            $checkProperties
     *
     * @return bool
     *
     * @phpstan-param TKey|null $key
     * @phpstan-param T $value
     */
    protected function internalSet(
        $key,
        &$value,
        bool $checkProperties = true
    ): bool {
        if (
            $checkProperties === true
            &&
            $this->properties !== []
        ) {
            $this->checkType($key, $value);
        }

        if ($key === null) {
            return false;
        }

        $this->generatorToArray();

        $array = &$this->array;

        /**
         * https://github.com/vimeo/psalm/issues/2536
         *
         * @psalm-suppress PossiblyInvalidArgument
         * @psalm-suppress InvalidScalarArgument
         */
        if (
            $this->pathSeparator
            &&
            (string) $key === $key
            &&
            \strpos($key, $this->pathSeparator) !== false
        ) {
            $path = \explode($this->pathSeparator, (string) $key);
            // crawl through the keys
            while (\count($path, \COUNT_NORMAL) > 1) {
                $key = \array_shift($path);

                $array = &$array[$key];
            }

            $key = \array_shift($path);
        }

        if ($array === null) {
            $array = [];
        } elseif (!\is_array($array)) {
            throw new \RuntimeException('Can not set value at this path "' . $key . '" because (' . \gettype($array) . ')"' . \print_r($array, true) . '" is not an array.');
        }

        $array[$key] = $value;

        return true;
    }

    /**
     * Convert a object into an array.
     *
     * @param mixed|object $object
     *
     * @return array|mixed
     *
     * @psalm-mutation-free
     */
    protected static function objectToArray($object)
    {
        if (!\is_object($object)) {
            return $object;
        }

        $object = \get_object_vars($object);

        /**
         * @psalm-suppress PossiblyInvalidArgument - the parameter is always some kind of array - false-positive from psalm?
         */
        return \array_map([static::class, 'objectToArray'], $object);
    }

    /**
     * @param array $data
     * @param bool  $checkPropertiesInConstructor
     *
     * @return void
     *
     * @phpstan-param array<mixed,T> $data
     */
    protected function setInitialValuesAndProperties(array &$data, bool $checkPropertiesInConstructor)
    {
        $checkPropertiesInConstructor = $this->checkForMissingPropertiesInConstructor === true
                                        &&
                                        $checkPropertiesInConstructor === true;

        if ($this->properties === []) {
            if (
                $this->checkPropertyTypes === true
                ||
                $checkPropertiesInConstructor === true
            ) {
                $this->properties = $this->getPropertiesFromPhpDoc();
            }

            /** @var TypeCheckInterface[] $properties */
            $properties = $this->properties;
            $requiredProperties = \array_diff_key($properties, $this->optionalProperties);

            if (
                $this->checkPropertiesMismatchInConstructor === true
                &&
                \count($data) !== 0
                &&
                \count(\array_diff_key($requiredProperties, $data)) > 0
            ) {
                throw new \TypeError('Property mismatch - input: ' . \print_r(\array_keys($data), true) . ' | expected: ' . \print_r(\array_keys($requiredProperties), true));
            }
        }

        foreach ($data as $key => &$valueInner) {
            $this->internalSet(
                $key,
                $valueInner,
                $checkPropertiesInConstructor
            );
        }
    }

    /**
     * sorting keys
     *
     * @param array      $elements
     * @param int|string $direction <p>use <strong>SORT_ASC</strong> (default) or <strong>SORT_DESC</strong></p>
     * @param int        $strategy  <p>use e.g.: <strong>SORT_REGULAR</strong> (default) or
     *                              <strong>SORT_NATURAL</strong></p>
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-param  array<mixed|TKey,T> $elements
     * @phpstan-return static
     */
    protected function sorterKeys(
        array &$elements,
        $direction = \SORT_ASC,
        int $strategy = \SORT_REGULAR
    ): self {
        $direction = $this->getDirection($direction);

        switch ($direction) {
            case 'desc':
            case \SORT_DESC:
                \krsort($elements, $strategy);

                break;
            case 'asc':
            case \SORT_ASC:
            default:
                \ksort($elements, $strategy);
        }

        return $this;
    }

    /**
     * @param array      $elements  <p>Warning: used as reference</p>
     * @param int|string $direction <p>use <strong>SORT_ASC</strong> (default) or <strong>SORT_DESC</strong></p>
     * @param int        $strategy  <p>use e.g.: <strong>SORT_REGULAR</strong> (default) or
     *                              <strong>SORT_NATURAL</strong></p>
     * @param bool       $keepKeys
     *
     * @return $this
     *               <p>(Mutable) Return this Arrayy object.</p>
     *
     * @phpstan-param array<mixed|TKey,T> $elements
     * @phpstan-return static
     */
    protected function sorting(
        array &$elements,
        $direction = \SORT_ASC,
        int $strategy = \SORT_REGULAR,
        bool $keepKeys = false
    ): self {
        $direction = $this->getDirection($direction);

        if (!$strategy) {
            $strategy = \SORT_REGULAR;
        }

        switch ($direction) {
            case 'desc':
            case \SORT_DESC:
                if ($keepKeys) {
                    \arsort($elements, $strategy);
                } else {
                    \rsort($elements, $strategy);
                }

                break;
            case 'asc':
            case \SORT_ASC:
            default:
                if ($keepKeys) {
                    \asort($elements, $strategy);
                } else {
                    \sort($elements, $strategy);
                }
        }

        return $this;
    }

    /**
     * @param array $array
     *
     * @return array
     *
     * @phpstan-param array<array-key, mixed> $array
     * @phpstan-return array<array-key, mixed>
     *
     * @psalm-mutation-free
     */
    private function getArrayRecursiveHelperArrayy(array $array)
    {
        if ($array === []) {
            return [];
        }

        \array_walk_recursive(
            $array,
            /**
             * @param array|self $item
             *
             * @return void
             */
            static function (&$item) {
                if ($item instanceof self) {
                    $item = $item->getArray();
                }
            }
        );

        return $array;
    }

    /**
     * @param int|string|null $key
     * @param mixed           $value
     *
     * @return void
     */
    private function checkType($key, $value)
    {
        if (
            $key !== null
            &&
            isset($this->properties[$key]) === false
            &&
            $this->checkPropertiesMismatch === true
        ) {
            throw new \TypeError('The key "' . $key . '" does not exist as a property definition. (' . \get_class($this) . ').');
        }

        if (isset($this->properties[self::ARRAYY_HELPER_TYPES_FOR_ALL_PROPERTIES])) {
            $this->properties[self::ARRAYY_HELPER_TYPES_FOR_ALL_PROPERTIES]->checkType($value);
        } elseif ($key !== null && isset($this->properties[$key])) {
            $this->properties[$key]->checkType($value);
        }
    }
}

voku / Arrayy / 30194830563

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