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.
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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.
const words = ['apple'…