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Discussion on: Please don't "overchain" array methods

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James Jones

That's why ghc does "loop fusion". JavaScript has the problem of allowing impure functions, but it should be able to notice pure functions and do loop fusion when it can, so the programmer needn't do the compiler's job for it.

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Basti Ortiz Author

This sounds like a great idea. Really, the only obstacle that stands in the way is implementation. I don't think it will be easy to make a JavaScript engine intelligent enough to detect pure functions and "fuse loops". Given the workload of JavaScript engines nowadays (execution, optimization, event loops, garbage collection, etc.), it seems to be a stretch to see this feature come in the near future.