array.splice

The splice() method changes the contents of an array by removing existing elements and/or adding new elements.

var myFish = ['angel', 'clown', 'mandarin', 'sturgeon'];

myFish.splice(2, 0, 'drum'); 
// myFish is ["angel", "clown", "drum", "mandarin", "sturgeon"]

myFish.splice(2, 1); 
// myFish is ["angel", "clown", "mandarin", "sturgeon"]

Syntax

array.splice(start)
array.splice(start, deleteCount)
array.splice(start, deleteCount, item1, item2, ...)

Parameters

start

Index at which to start changing the array (with origin 0). If greater than the length of the array, actual starting index will be set to the length of the array. If negative, will begin that many elements from the end of the array.

deleteCount Optional

An integer indicating the number of old array elements to remove. If deleteCount is 0, no elements are removed. In this case, you should specify at least one new element. If deleteCount is greater than the number of elements left in the array starting at start, then all of the elements through the end of the array will be deleted.

If deleteCount is omitted, deleteCount will be equal to (arr.length - start).

item1, item2, ... Optional

The elements to add to the array, beginning at the start index. If you don't specify any elements, splice() will only remove elements from the array.

Return value

An array containing the deleted elements. If only one element is removed, an array of one element is returned. If no elements are removed, an empty array is returned.

Description

If you specify a different number of elements to insert than the number you're removing, the array will have a different length at the end of the call.

Examples

Remove 0 elements from index 2, and insert "drum"

var myFish = ['angel', 'clown', 'mandarin', 'sturgeon'];
var removed = myFish.splice(2, 0, 'drum');

// myFish is ["angel", "clown", "drum", "mandarin", "sturgeon"] 
// removed is [], no elements removed

Remove 1 element from index 3

var myFish = ['angel', 'clown', 'drum', 'mandarin', 'sturgeon'];
var removed = myFish.splice(3, 1);

// removed is ["mandarin"]
// myFish is ["angel", "clown", "drum", "sturgeon"] 

Remove 1 element from index 2, and insert "trumpet"

var myFish = ['angel', 'clown', 'drum', 'sturgeon'];
var removed = myFish.splice(2, 1, 'trumpet');

// myFish is ["angel", "clown", "trumpet", "sturgeon"]
// removed is ["drum"]

Remove 2 elements from index 0, and insert "parrot", "anemone" and "blue"

var myFish = ['angel', 'clown', 'trumpet', 'sturgeon'];
var removed = myFish.splice(0, 2, 'parrot', 'anemone', 'blue');

// myFish is ["parrot", "anemone", "blue", "trumpet", "sturgeon"] 
// removed is ["angel", "clown"]

Remove 2 elements from index 2

var myFish = ['parrot', 'anemone', 'blue', 'trumpet', 'sturgeon'];
var removed = myFish.splice(myFish.length - 3, 2);

// myFish is ["parrot", "anemone", "sturgeon"] 
// removed is ["blue", "trumpet"]

Remove 1 element from index -2

var myFish = ['angel', 'clown', 'mandarin', 'sturgeon'];
var removed = myFish.splice(-2, 1);

// myFish is ["angel", "clown", "sturgeon"] 
// removed is ["mandarin"]

Specifications

Specification	Status	Comment
ECMAScript 3rd Edition (ECMA-262)	Standard	Initial definition. Implemented in JavaScript 1.2.
ECMAScript 5.1 (ECMA-262) The definition of 'Array.prototype.splice' in that specification.	Standard
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Array.prototype.splice' in that specification.	Standard
ECMAScript 2017 Draft (ECMA-262) The definition of 'Array.prototype.splice' in that specification.	Draft

Browser compatibility

See also

• push() / pop() — add/remove elements from the end of the array
• unshift() / shift() — add/remove elements from the beginning of the array
• concat() — returns a new array comprised of this array joined with other array(s) and/or value(s)