Bug 8324 – Arrays seen as callables for map/filter

A low-priority enhancement request. In some cases the mapping function is just an array or associative array: import std.stdio, std.range, std.algorithm; void main() { auto a = [0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1]; iota(0, a.length).filter!(i => a[i])().writeln(); } Output: [1, 4, 9, 16] So maybe filter/map (and few other higher order functions) can be improved (using a new little function in std.functional) to see a given array/associative array as a callable: iota(0, a.length).filter!a().writeln(); The Clojure language supports something similar.

Also see issue 6110.

*** This issue has been marked as a duplicate of issue 6110 ***