toMap and toSet

[Jack-Works]

Just like toArray, I think we should have it. Not too late before we go to the stage 3

[bakkot]

See previous discussion in e.g. #36 (comment) and #17.

Personally I don't think anything other than toArray should be in this proposal. The problem of constructing collections in general is a much larger space; as mentioned in the above-linked comment, Array really is uniquely privileged in a way that Map and Set are not.

(Also, I'm not convinced that Stage 2 is an appropriate time to add new methods. The major semantics are supposed to be settled at this point.)

[Jack-Works]

fine though I think it is very useful to make us map on a Map or something

[ljharb]

I agree, but that’s what follow up proposals are for.

[devsnek]

we are past the point of adding new methods, and have been for several months.