JavaScript unshift() Method
 Complete Array Object Reference
Definition and Usage
The unshift() method adds one or more elements to the beginning of an array and returns the new length.
Syntax
arrayObject.unshift(newelement1,newelement2,....,newelementX)
|
| Parameter |
Description |
| newelement1 |
Required. The first element to add to the array |
| newelement2 |
Optional. The second element to add to the array |
| newelementX |
Optional. Several elements may be added |
Tips and Notes
Note: This method changes the length of the array.
Note: The unshift() method does not work properly in Internet
Explorer!
Tip: To add one or more elements to the end of an array, use the
push() method.
Example
In this example we will create an array, add an element to the beginning of
the array and then return the new length:
<script type="text/javascript">
var arr = new Array();
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
document.write(arr + "<br />");
document.write(arr.unshift("Kai Jim") + "<br />");
document.write(arr);
</script>
|
The output of the code above will be:
Jani,Hege,Stale
4
Kai Jim,Jani,Hege,Stale
|
Try-It-Yourself Demos
unshift()
How to use unshift() to add an element to the beginning of an array and return
the new length.
Complete Array Object Reference
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