What is a higher-order function in JavaScript?
A function that takes a function as an argument, returns a function, or both. Examples: map, filter, reduce, compose, curry, partial, setTimeout, and event listeners.
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More FAQs in Functions as Arguments and Return Values in JavaScript
Yes. This is a callback. setTimeout, map, filter, reduce, event listeners, and fetch.then all accept functions as arguments. The receiving function (higher-order) calls the callback at the right time.
Yes. A function that returns another function is a higher-order function (a function factory). The returned function often closes over the outer function's variables, creating a closure.
Passing different functions as arguments to achieve different behaviors. For example, process(data, sortAscending) vs process(data, sortDescending). The function (strategy) is passed as an argument.
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