Provide an easy way to create a new array, filled via a mapping function

@theScottyJam @ljharb @jschoi

I just put all my thoughts into a package:

I am hoping to make a proposal with these methods, but neither I am familiar with writing a specification, nor I will have much time to do so. If anyone could help with the proposal, it would be appreciated.

Here is the source code in TypeScript:

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