Change for loop to map.

[makara]

Thanks but I have a lot of for loops and we may want to change most of them to keep consistent.

Let me test with a benchmark first.

[xeodou]

Sure.

[makara]

Just realised that I already have a benchmark about that, built for mixin(). And for loop is actually faster.

Problem here is actually not the loops, but I don't need the return, and with coffee I need to return nothing explicitly. Changing that and closing this.