Are map, filter, and reduce higher-order functions?
Yes. They take a callback function as an argument. map transforms each element, filter selects elements, and reduce combines elements into a single value.
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More FAQs in What Are Higher-Order Functions in JavaScript?
A function that takes a function as an argument, returns a function, or both. This is possible because functions are first-class citizens in JavaScript.
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.
They enable abstraction (hide details), reusability (write one function, use it with many callbacks), composition (chain small functions into pipelines), and functional programming (pure functions, immutability).
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