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JavaScript splice() Method

Array Object Reference JavaScript Array Object

Definition and Usage

The splice() method is used to remove and add new elements to an array.

Syntax

arrayObject.splice(index,howmany,element1,.....,elementX)

Parameter Description
index Required. Specify where to add/remove elements. Must be a number
howmany Required Specify how many elements should be removed. Must be a number, but can be "0"
element1 Optional. Specify a new element to add to the array
elementX Optional. Several elements can be added

Examples

Example 1

Add an element to an array:

<script type="text/javascript">

var arr = new Array(5);
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

document.write(arr + "<br />");
arr.splice(2,0,"Lene");
document.write(arr + "<br />");

</script>

The output of the code above will be:

Jani,Hege,Stale,Kai Jim,Borge
Jani,Hege,Lene,Stale,Kai Jim,Borge

Try it yourself »

Example 2

Remove the element at index 2 ("Stale"), and add a new element ("Tove") here (at index 2):

<script type="text/javascript">

var arr = new Array(5);
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

document.write(arr + "<br />");
arr.splice(2,1,"Tove");
document.write(arr);

</script>

The output of the code above will be:

Jani,Hege,Stale,Kai Jim,Borge
Jani,Hege,Tove,Kai Jim,Borge

Try it yourself »

Example 3

Remove three elements, starting at index 2, and add a new element ("Tove") there instead:

<script type="text/javascript">

var arr = new Array(5);
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

document.write(arr + "<br />");
arr.splice(2,3,"Tove");
document.write(arr);

</script>

The output of the code above will be:

Jani,Hege,Stale,Kai Jim,Borge
Jani,Hege,Tove

Try it yourself »

Array Object Reference JavaScript Array Object

From http://www.w3schools.com (Copyright Refsnes Data)