[swift-evolution] [swift-evolution-announce] [Review] SE-0045: Add scan, prefix(while:), drop(while:), and iterate to the stdlib

[Pyry Jahkola]

> I would really like a different name for scan. While it’s the term of art for Haskell and co, it really seems meaningless to regular programmers (why is “scanning” the way you produce an array of intermediate reduces?), and it would be better to follow the pattern already established elsewhere in the library to give friendlier names e.g. flatMap instead of bind, reduce instead of fold.
> 
> I think Python calls it accumulate: http://docs.python.org/3/library/itertools.html#itertools.accumulate <http://docs.python.org/3/library/itertools.html#itertools.accumulate>

FWIW, Clojure calls it `reductions <http://clojure.github.io/clojure/clojure.core-api.html#clojure.core/reductions>` which aligns pretty nicely with the `reduce` counterpart.

> I also think it would be nice for both scan and reduce to have overloads that take the first value as the initial (and return an optional) but that’s probably a separate proposal.

+1

— Pyry

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