Репост из: Front End World
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https://medium.freecodecamp.org/want-to-learn-es6-take-this-free-23-part-course-and-become-a-javascript-ninja-55002db1ff74
https://medium.freecodecamp.org/want-to-learn-es6-take-this-free-23-part-course-and-become-a-javascript-ninja-55002db1ff74