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Javascript 1.7 (Mozilla) has generators which is eventually the same
thing as coroutines (just a tad more ugly to look at :-), but you are
restricting yourself to Mozilla/Spidermonkey then.

"ECMAScript Harmony" plans to have generators

But who knows if this is going to be a consensus or a drama like ECMAScript 1.4

The same goes for 'let' which ought to provide proper lexical scoping.
Available now in Mozilla/Spidermonkey only, might be in a future
ECMAScript, might also be not.