ridiculous speed gain with while

[fiatjaf]

http://jsperf.com/immupdate-while-vs-foreach

if I were you I would never accept such a petulant pull request.

[AlexGalays]

forEach can't be as fast as a while or a for loop by design; Did you really encounter a bottleneck? That would be surprising!
I'm inclined to leave it as is, 28% faster in chrome while introducing a local variable isn't particularly sexy :p

[fiatjaf]

No problem. No bottleneck. This was just an exercise.

But why is a local variable so bad?

[AlexGalays]

A local variable is not so bad, it's just that i'd rather have the equivalent code that doesn't use an extra variable if I can help it :)