Higher-order functions take other functions as arguments or return ... and thus are a big no-no in the world of functional programming. The following JavaScript code violates this principle because it ...

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Providing fast at scale HashMap, LinkedHashMap, and Higher Order Functions to any iterable, such as Array, Map or Set. Tested, and Benchmarked, Issues & PRs welcomed.

JavaScript added the arrow operator ... In all three examples above, you can see that higher-order functions are at work. The map() function in both languages accepts a function as the argument.

At its core, a higher-order function is just a function that accepts a function as an argument or returns a function. This is possible in JavaScript thanks to first-class functions, which means ...