Andreas Rossberg wrote:
Dave did: http://wiki.ecmascript.org/doku.php?id=strawman:return_to_label It did not seem to be headed for consensus and inclusion in harmony:proposals when we last discussed it.Interesting. But this is different from what I had in mind. It is more like a generalisation of 'break', while I was thinking of something like:function f(o) { o.forEach(function g(x) { if (...) return 0 from f; let x2 = x.map(function h(y) { if (...) return from g return y*2 // returns from h }) ... }) return 27 }That is, just a way for referring to the specific function (or arrow function, if we had a syntax for naming them) that the return is supposed to be associated with.
Nice. This gives functions some of the oomph of block-lambdas (see https://gist.github.com/1677893 from @wavded [Marc Harter]). However:
* Requires function declarations, or seems to -- too restrictive (vs. arrows as block-lambda replacement in the gist above)?
* Waldemar's point about try/finally standing in the way of a forced return. Perhaps this is "you get what you ask for".
Still, very pretty syntax, nice contextual 'from' keyword linkage.
(I suppose Dave's proposal can encode that, but it would result in less natural and significantly more verbose code.)
(Yes, it's escape continuations for JS, so it can do more but you have to say more.)
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