Array.prototype.push()

Summary

The push() method adds one or more elements to the end of an array and returns the new length of the array.

Syntax

arr.push(element1, ..., elementN)

Parameters

element1, ..., elementN
The elements to add to the end of the array.

Returns

The new length property of the object upon which the method was called.

Description

The push method appends values to an array.

push is intentionally generic. This method can be used with call() or apply() on objects resembling arrays. The push method relies on a length property to determine where to start inserting the given values. If the length property cannot be converted into a number, the index used is 0. This includes the possibility of length being nonexistent, in which case length will also be created.

The only native, array-like objects are Strings, although they are not suitable in applications of this method, as strings are immutable.

Examples

Example: Adding elements to an array

The following code creates the sports array containing two elements, then appends two elements to it. The total variable contains the new length of the array.

var sports = ["soccer", "baseball"];
var total = sports.push("football", "swimming");

console.log(sports); // ["soccer", "baseball", "football", "swimming"]
console.log(total);  // 4

Specifications

Specification Status Comment
ECMAScript 3rd Edition Standard Initial definition. Implemented in JavaScript 1.2
ECMAScript Language Specification 5.1th Edition (ECMA-262) Standard  
ECMAScript Language Specification 6th Edition (ECMA-262) Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 1.0 1.0 (1.7 or earlier) 5.5 (Yes) (Yes)
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

See also

Hide Sidebar