Just playing with compiler explorer to see assembly line count.

[SrMordred]

On Tuesday, 3 October 2017 at 17:15:04 UTC, Daniel Kozak wrote:
> is not bad
>
> https://godbolt.org/g/bSfubs

Thats cool, I never used copy xD.
(but you returned the .copy range, not the 'r' array ;p)

//now with ldc 1.4 and -O3 -release -boundscheck=off

foreach       -> 99 lines
.filter.copy  -> 368 lines
.filter.array -> 1229 lines (1002 lines with -O1)