Advanced Array Methods and Functional Programming in JavaScript

JavaScript’s array methods offer a powerful way to manipulate and transform data, especially when combined with functional programming techniques. Understanding these advanced methods can make your code more readable, concise, and expressive.

Not a Medium member? Read this article here

In this article, we’ll explore some advanced array methods and see how functional programming concepts like pure functions, immutability, and higher-order functions fit into the picture.

1. Higher-Order Array Methods

Higher-order methods take a callback function as an argument, making it easy to write clean and reusable logic. Let’s explore some of these advanced methods:

1.1 Array.map()

Transforms every element of an array and returns a new array without mutating the original.

const numbers = [1, 2, 3, 4];
const squares = numbers.map(n => n ** 2);
console.log(squares); // [1, 4, 9, 16]

• Use case: Transforming an array without side effects.

1.2 Array.filter()

Returns a new array containing only the elements that match a certain condition.