.map() vs .forEach() vs for ()

Due to the amount of traffic this article still receives, it has been given a much needed refresh. For the sake of comments that happened before July 19, 2017, the original version is still available here: https://ryanpcmcquen.org/javascript/2015/10/25/DEPRECATED-map-vs-foreach-vs-for.html You may find yourself at a point where you wonder whether to use .map(), .forEach() or for (). You should fav

[uraway]

.mapは遅いが拡張しやすく読みやすい。.forEachはネイティブメソッドの中では速い。for loop は速いがメモリを食うので使い所を考える ってな感じか