> In principle, with functions-as-collections the yield and the whole > generators stuff > is not needed. If functions can be used on the right of 'in' or 'of' > in 'for' then > all 'yield' use cases that I saw so far can be implemented without the > yield. > So why do we need redundant entities?
Semi-coroutines for asynchronous computations is one: https://github.com/killdream/promises-benchmark/blob/master/scenarios/serial/co.js#L49-L77
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