String builder pattern is irrelevant

[fracture91]

I know there are some places in the code (usercolors) that build strings by pushing substrings into an array and then .joining the array. This "optimization" is irrelevant and was probably only ever useful for old IE versions. string.concat(blah) and the += operator are much faster.

http://jsperf.com/array-push-vs-unshift/22
https://pay.reddit.com/r/programming/comments/16e1kh/gmails_javascript_garbage_collection_hacks/c7vaa91