Those are examples of higher-order functions that accept functions as arguments, but plenty of them return functions as well. If you’ve ever seen a function call that has two sets of parentheses ...

For example, implementing an immutable list structure could be easily done with virtually no additional logic: ... JavaScript tutorial: Higher-order functions. Apr 18, 2019 4 mins. how-to.

Functional programming supports higher-order functions and first-order functions. Higher-order functions take other functions as arguments or return functions as results. ... 4 pseudocode examples: ...