[robrichard]

I think this article ignores that JavaScript's standard library has been growing in pace with new language features. The author mentions underscore as a good place to draw inspiration, but a ton of it's functionality has already been added to the language. forEach, map, reduce, filter, every, some, and others were added in ES5. ES6 brings find, includes, isArray, Object.assign and others. Promises were also added, make a library for them now unnecessary. Many of the current proposals aren't just for syntax additions to language, but to implement more standard library type of stuff (including string padding).