Do you even learn, bro?

ES5 is fairly mainstream at this point, but a lot of real-world developers still have to deal with the likes of IE8 or other legacy support, and shims and polyfills to add missing and expected functionality. ES6 has been pretty heavily fleshed out, and is starting to gain adoption amongst some of the evergreen vendors, but still has a long way to go. ES7 is still very much in the proposal stages.
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