On 10 July 2011 22:23, David Herman <dher...@mozilla.com> wrote:
> Another common and useful fusion of two traversals that's in many Schemes is
> map-filter or filter-map:
>
> a.filterMap(f) ~~~ [res for [i,x] of items(a) let (res = f(x, i)) if (res
> !== void 0)]
>
> I rather arbitrarily chose to accept both null and undefined here as way to
> say "no element" -- a reasonable alternative would be to accept *only*
> undefined as "no element".
\bikeshed{ The SML lib calls this one mapPartial, which I think is a
much better name. }
/Andreas
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