The push() method adds new items to the end of an array. The push() method changes the length of the array. The push() method returns the new length.

Nov 17, 2024 · Using the spread (…) operator, you can add elements to the end of an array by creating a new array and combining the original array with the new elements. JavaScript let a = [ 1 , 2 , 3 ]; let b = [... a , 4 , 5 ]; console . log ( b );

Dec 9, 2008 · push() adds a new element to the end of an array. pop() removes an element from the end of an array. To append an object (such as a string or number) to an array, use: array.push(toAppend);

Jun 3, 2016 · The concat() method can be given a single (or multiple) values without the need of encapsulating the value(s) in an array first, for example: ['a', 'b'].concat('c'); // instead of .concat(['c']); From MDN (my emphasis): Arrays and/or values to concatenate into a new array.

Nov 17, 2024 · Here are different ways to add elements to an array in JavaScript. 1. Using push () Method. The push () method adds one or more elements to the end of an array and returns the new length of the array. Syntax. 10, 20, 30, 40, 50, 60, 70. 2. Using unshift () Method.

Dec 30, 2016 · You can use arr[arr.length] = value as array.length always +1 of the index of last element. Which true in this options? You can use the second option. Array instance .length is 0-based, beginning at 0.

Aug 25, 2020 · When you want to add an element to the end of your array, use push(). If you need to add an element to the beginning of your array, try unshift(). And you can add arrays together using concat().

Nov 13, 2024 · The JavaScript push () method is used to insert elements at the end of the array. To add an element at the nth index of the array we can simply use the array length property.

In this post you'll learn two ways to add an item to the end of an array in JavaScript, .push and .concat.

Feb 11, 2021 · This tutorial shows you three ways of appending new items to the end of an existing array. JavaScript comes with the Array#push method allowing you to push one or more items to the end of the array. You may also append new items by creating a new array using the spread operator to push existing items to the beginning.