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Check out the book You Don't Know JS (https://github.com/getify/You-Dont-Know-JS/blob/master/async...) for more details on Promises and, in general, on asynchronous programming.

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I'll plug "scopes & closures" and "this & object prototypes" as well. Fairly quick reads and you'll understand JS better than your average developer afterwards.

Kyle Simpson is crazy. Read the first third of any of his books and then put them down before you get to the part where he goes off the rails. The "Scopes and Closures" one is particularly ridiculous... He goes off on a tangent about how let bindings should be written with a specific syntax and don't worry he's written a transpiler for it so you don't have to bother using the standard.

He can get preachy about his preferred (subjective) method of solving some problems, but you can't deny he does a good job of explaining the fundamentals in an easy to understand manner. That is, it doesn't feel like reading a textbook.

Bottom line, the books have a lot value in them for the time investment it takes to read them.

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