A higher order function is a function that takes one or more functions as arguments, or returns a function as its result.
These functions are powerful because they allow you to abstract and compose operations in a flexible and reusable way. They are a fundamental concept in functional programming.
Common examples of higher order functions are .map(), .filter(), and reducer().
.map(): Takes a function as an argument and applies it to each element in an array, returning a new array with the results.
const numbers = [1, 2, 3, 4];
const doubled = numbers.map(num => num * 2);
console.log(doubled); // [2, 4, 6, 8]