Higher-Order Functions

A higher-order function is a function that either takes another function as an argument or returns a function as a result.

Example

function multiplyBy(factor) {
    return function(number) {
        return number * factor;
    };
}

const double = multiplyBy(2);
console.log(double(5)); // Output: 10

Explanation: multiplyBy is a higher-order function because it returns another function that multiplies a number by the given factor.

Application: Higher-order functions are widely used in JavaScript for tasks like array manipulation, event handling, and more.