anon3433··on ES6 for beginners, part 3Array.prototype.map()[1] has been in js since ES5. Likewise with filter[2] and reduce[3]...[1] http://es5.github.io/#x15.4.4.19[2] http://es5.github.io/#x15.4.4.20[3] http://es5.github.io/#x15.4.4.21
anon3433··on Learn React Fundamentals and Advanced PatternsTelling people to go and upvote a post is a little desperate, don't you think? https://twitter.com/kentcdodds/status/938060149368881152