[swift-evolution] [swift-evolution-announce] [Review] SE-0045: Add scan, prefix(while:), drop(while:), and iterate to the stdlib
Dave Abrahams
dabrahams at apple.com
Thu Apr 28 17:09:58 CDT 2016
on Thu Apr 28 2016, Pyry Jahkola <swift-evolution at swift.org> wrote:
> 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
>
> FWIW, Clojure calls it `reductions` which aligns pretty nicely with the `reduce
> ` counterpart.
That's cute.
> 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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--
Dave
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