Andreas Rossberg wrote:
On 29 March 2012 16:11, Brendan Eich <[email protected]
<mailto:[email protected]>> wrote:
Yesterday, Luke made a stronger point: TCP 'return' means async
callbacks (e.g. promise when functions) must be written ML-style,
with return value in tail position. Callbacks can be lengthy, so
writing and if-else nest with a variable holding the r.v. to
achieve this is awkward and users will prefer early returns (so
the calllback's spine is the normal execution path). But TCP will
make these wrong-return bugs.
I actually think this is a less severe problem. Ignoring the issue of
potential confusion for users (which is real), the main thing lacking
there in terms of expressiveness is some labelled variant of 'return',
analogous to break and continue. If we were so inclined, I'm sure we
could come up with something usable on that front.
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.
/be
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