abs-lang / abs / 1280

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symmetric vs asymmetric difference

Computes the difference between 2 arrays,
returning elements that are only on the first array:

```bash
[1, 2, 3].diff([]) # [1, 2, 3]
[1, 2, 3].diff([3]) # [1, 2]
[1, 2, 3].diff([3, 1]) # [2]
[1, 2, 3].diff([1, 2, 3, 4]) # []
```

For symmetric difference see [diff_symmetric(...)](#diff_symmetricarray)

Computes the [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
between 2 arrays (elements that are only on either of the 2):

```bash
[1, 2, 3].diff([]) # [1, 2, 3]
[1, 2, 3].diff([3]) # [1, 2]
[1, 2, 3].diff([3, 1]) # [2]
[1, 2, 3].diff([1, 2, 3, 4]) # [4]
```

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