What are higher-order functions?

A higher-order function is a function that takes another function as an argument or

returns a function.

They are key to functional programming in JavaScript.

Example:

function greet(name) {

return `Hello, ${name}`;

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function processUser(callback) {

return callback("Alice");

console.log(processUser(greet)); // Hello, Alice

Functions like map(), filter(), and reduce() are higher-order functions.