source-academy / js-slang / 1611

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SUBST (#320)

* WIP: Yarn Build works

* WORKING: Add treeifier

* Working prototype: Source 1 substituter

* Fix blockExpression in source 1, started source 2

* Fix block expression and logical expression

1. Now logical expressions are evaluated into expressions
2. Block expressions with a single statement as body, and if the
    statement is an Expression Statement with irreducible expression,
    the block will be reduced into undefined.

* Bump version (#325)

* Added builtin functions for source 1, 2.

* Add tests for substituter

* Add ArrayExpression as an irreducibleNode

Fix stringify.

* Add constants prelude

Fix also the complications of Infinity and NaN

* Remove debugging statements and update tests

* Fix problems with builtin functions

* Add tests

* Add substituter and treeifier for LogicalExpr

and update test snapshots

* Fix return values of builtin math functions

with refactoring

* Fix builtin math on neg argument and is_function

* Function equality uses javascript's ===

update tests

* Remove debugging statements and update test snapshots

* 0.3.0

* Eliminate substituter hangs from using libraries

* 0.3.1

718 of 886 branches covered (81.04%)

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2123 of 2351 relevant lines covered (90.3%)

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