How to merge two or more arrays in JavaScript

#javascript #array #es6

Last updated on Sep 7, 2020 by Suraj Sharma

In this tutorial, you will learn how you can merge two or more arrays in JavaScript.

I am going to discuss two approaches to concatenate two arrays.

Suppose we have two arrays to merge.

const array1 = ['Apple', 'Banana', 'Cherry'];

const array2 = ['Stawberry', 'Kiwis', 'Blueberry'];

Merge Arrays

1. Using ES6 Array destructuring

Merging two arrays can be done by using ES6 array destructuring, to create a third array.

const array3 = [...array1, ...array2];

console.log(array3); // ["Apple","Banana","Cherry","Stawberry","Kiwis","Blueberry"]

However, some old browsers, still don’t support Array destructing.

2. Using concat() method

Array.concat() method joins the called Array with a new array and returns a new array. It does not change the existing arrays.

const array3 = array1.concat(array2)

console.log(array3); // ["Apple","Banana","Cherry","Stawberry","Kiwis","Blueberry"]

console.log(array1); // ['Apple', 'Banana', 'Cherry']

console.log(array2); // ['Stawberry', 'Kiwis', 'Blueberry']

Both the above approaches can be used for achieving immutability in JavaScript.

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Suraj Sharma is a JavaScript Software Engineer. He holds a B.Tech degree in Computer Science & Engineering from NIT Rourkela.