Implementation of Proposal tc39/proposal-change-array-by-copy

[mschlaegl]

Experimental implementation of tc39/proposal-change-array-by-copy: Provides additional methods on Array.prototype and TypedArray.prototype to enable changes on the array by returning a new copy of it with the change.

Implemented:

• Array.prototype.toReversed() -> Array
• Array.prototype.toSorted(compareFn) -> Array .. TODO: Generalization necessary: see specification: sort, SortIndexedProperties, CompareArrayElements, ...)
• Array.prototype.toSpliced(start, deleteCount, ...items) -> Array .. TODO: Optimizations possible.
• Array.prototype.with(index, value) -> Array
• TypedArray.prototype.toReversed() -> TypedArray .. TODO: Additional work is required to meet the specification.
• TypedArray.prototype.toSorted(compareFn) -> TypedArray .. TODO: Additional work is required to meet the specification.
• TypedArray.prototype.with(index, value) -> TypedArray .. TODO: Additional work is required to meet the specification.

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[wirthi]

(Parts of) this code has been merged in the PR https://github.com/oracle/graaljs/commit/6e1fb8b91fea8a969b1033e908a3d380a0b97a76

You can see your contribution on https://github.com/oracle/graaljs/pulse as well.