Mark S. Miller wrote:
My other suspicion: The previous failure of this proposal was before
many people had much hands on experience using higher order functions
in JS as a normal alternative to control structures. Now that we all
have, the need for a non-local escape may be more visceral.
Just in case anyone wants my historical two cents, I don't think this is
true. I championed both
http://wiki.ecmascript.org/doku.php?id=strawman:block_lambda_revival
and
http://wiki.ecmascript.org/doku.php?id=strawman:arrow_function_syntax
starting well after (spring 2011) the modern (Prototype.js, 2005?)
higher-order function revival in JS.
Anyway, however much more momentum there is today compared to four years
ago, we still don't have a clear winner. But we've been over this
ground. I dug up some more links in a few minutes of site: googling.
Dave Herman proposed return to label here:
http://wiki.ecmascript.org/doku.php?id=strawman:return_to_label
This led to (among others):
https://esdiscuss.org/topic/march-24-meeting-notes#content-13
where Andreas Rossberg proposed `return from` to address the problem
cited in this thread's o.p. His example used forEach, but no matter:
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
}
/be
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