Higher-Order Functions — Free JavaScript Tutorial

Learn Higher-Order Functions in JavaScript with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

Higher-Order Functions — Free JavaScript Tutorial

Learn Higher-Order Functions in JavaScript with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

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TL;DR: Learn Higher-Order Functions in JavaScript with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

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Higher-Order Functions in JavaScript

A Higher-Order Function (HOF) either takes a function as an argument OR returns a function (or both).

Examples of built-in HOFs: `.map()`, `.filter()`, `.reduce()`, `.sort()`, `.forEach()`, `addEventListener()`.

Currying: transforming a function with multiple arguments into a sequence of functions with one argument each.

Function composition: `const compose = (f,g) => x => f(g(x))` — apply g first, then f.

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