Add replacement for List.filterMap#75
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jfmengels wants to merge 1 commit into
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mdgriffith
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Feb 6, 2022
| var end = tmp; | ||
| for (; xs.b; xs = xs.b) { | ||
| var m = f(xs.a); | ||
| if (!m.$) { |
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Should this actually check for m.a? I'm assuming that every elm type has a $ 🤔
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The check is not about the presence of the $ field, it's about whether the Maybe returned by the function is Nothing ($ = 1 IIRC) or Just ($ = 0).
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This is applying the same technique from other List optimizations and applying it to
List.filterMap.Benchmark can be found here.
Here are the improvements (all taken using eol2) for Chrome:
and for Firefox:
