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    See Is micro-optimisation important when coding? Commented Mar 27, 2019 at 1:48
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    are you sure it iterates twice? I would expect it to iterate once, applying each function in turn as your expanded method does Commented Mar 27, 2019 at 9:48
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    @Ewan not that familiar with swift but it appears it does unless you explictly ask for laziness stackoverflow.com/questions/51917054/… Commented Mar 27, 2019 at 12:04