Array.shift Redirect 1

Summary

The shift() method removes the first element from an array and returns that element. This method changes the length of the array.

Syntax

arr.shift()

Description

The shift method removes the element at the zeroeth index and shifts the values at consecutive indexes down, then returns the removed value. If the length property is 0, undefined is returned.

shift is intentionally generic; this method can be called or applied to objects resembling arrays. Objects which do not contain a length property reflecting the last in a series of consecutive, zero-based numerical properties may not behave in any meaningful manner.

Examples

Example: Removing an element from an array

The following code displays the myFish array before and after removing its first element. It also displays the removed element:

var myFish = ["angel", "clown", "mandarin", "surgeon"];

console.log("myFish before: " + myFish);

var shifted = myFish.shift();

console.log("myFish after: " + myFish);
console.log("Removed this element: " + shifted);

This example displays the following:

myFish before: angel,clown,mandarin,surgeon
myFish after: clown,mandarin,surgeon
Removed this element: angel

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

Document Tags and Contributors

Contributors to this page: Sheppy
Last updated by: Sheppy,
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