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There are many ways to compose deferrables, primarily by grouping several of them together into something which is also a deferrable. See the em-scenario gem for examples:


Note: I still think this approach sucks.

V8 provides a really awesome shared-nothing multithreading scheme via web workers. It's just nobody uses them.

Oh right that's definitely true and is much more elegant. I was talking about when a function written in synchronous style (in a long stack of synchronous calls) needs to call something asynchronous.

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