Issue 2355 in v8: Implement `yield` for generators

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Status: New
Owner: ----

New issue 2355 by longs...@gmail.com: Implement `yield` for generators
http://code.google.com/p/v8/issues/detail?id=2355

Generators have been approved for ES.next:
http://wiki.ecmascript.org/doku.php?id=harmony:generators

Firefox currently implements the `yield` keyword, but not the function*()
{} syntax. I think v8 should do the same for now.

I searched everywhere and I can't find any existing bugs or plans for the
`yield` keyword. This is a significant feature for javascript, one of the
few that introduces a new semantic that is very difficult to simulate
without native support.

This would have a big impact on node.js as well, allowing better style for
async code.

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Comment #1 on issue 2355 by gorgi.ko...@gmail.com: Implement `yield` for
generators
http://code.google.com/p/v8/issues/detail?id=2355

+1. While for some people this will be just a "nice to have", for complex
JS code and especially in node.js it would make all the difference in the
world. It will enable people to write coroutine-like code instead of crufty
and sometimes convoluted callback boilerplate.

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Comment #2 on issue 2355 by gorgi.ko...@gmail.com: Implement `yield` for

Edit: forgot to add - for example, something like task.js
http://taskjs.org/ + V8 would mean pure awesome (especially for node)

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Comment #3 on issue 2355 by kurtisfi...@gmail.com: Implement `yield` for
generators
http://code.google.com/p/v8/issues/detail?id=2355

All I can say is ... what's the hold up? Firefox has had this for 5 years
now. You guys could at least make it conditionally compiled so that
node.js can use it. And while I'm dreaming maybe you could implement
the 'async' keyword? Of course that would mean having a task framework
like .Net, which would imply having a standard framework period.

I wish someone could at least explain why generators are not being
implemented in V8.

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Comment #4 on issue 2355 by disfated: Implement `yield` for generators
http://code.google.com/p/v8/issues/detail?id=2355

I would give all Harmony features for only the support for generators. I
believe it will bring ssjs to a comletely new level. So... WHEN??? :)

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Comment #5 on issue 2355 by aarons...@gmail.com: Implement `yield` for
generators
http://code.google.com/p/v8/issues/detail?id=2355

Please, for the love of all that is good, yes. Sooner than later.

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Updates:
Status: Accepted

Comment #6 on issue 2355 by yan...@chromium.org: Implement `yield` for
generators
http://code.google.com/p/v8/issues/detail?id=2355

(No comment was entered for this change.)

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Comment #7 on issue 2355 by kurtisfi...@gmail.com: Implement `yield` for
generators
http://code.google.com/p/v8/issues/detail?id=2355

Yay!

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Comment #8 on issue 2355 by disfated: Implement `yield` for generators
http://code.google.com/p/v8/issues/detail?id=2355

Thanks all gods!

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Updates:
Owner: mstar...@chromium.org

Comment #9 on issue 2355 by yan...@chromium.org: Implement `yield` for
generators
http://code.google.com/p/v8/issues/detail?id=2355

(No comment was entered for this change.)

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Comment #10 on issue 2355 by tobias.b...@gmail.com: Implement `yield` for
generators
http://code.google.com/p/v8/issues/detail?id=2355

Thank you!

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Comment #11 on issue 2355 by mieli...@gmail.com: Implement `yield` for
generators
http://code.google.com/p/v8/issues/detail?id=2355

Please make it an expression so one can conveniently pass a value to
generator, e.g.:

var x;
x = yield;

or

return yield MyAsyncFunction();

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Comment #12 on issue 2355 by edy.b...@gmail.com: Implement `yield` for
generators
http://code.google.com/p/v8/issues/detail?id=2355

The specs already has yield as an expression, so they should implement it
that way.

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Updates:
Cc: rossb...@chromium.org
Labels: Harmony

Comment #13 on issue 2355 by yan...@chromium.org: Implement `yield` for
generators
http://code.google.com/p/v8/issues/detail?id=2355

(No comment was entered for this change.)