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JavaScript unshift() Method


Array Object Reference JavaScript Array Object

Definition and Usage

The unshift() method adds new elements to the beginning of an array, and returns the new length.

Note: This method changes the length of an array!

Syntax

array.unshift(element1,element2, ..., elementX)

Parameter Description
element1,element2, ..., elementX Required. The element(s) to add to the beginning of the array


Browser Support

Internet Explorer Firefox Opera Google Chrome Safari

The unshift() method is supported in all major browsers, except Internet Explorer.


Tips and Notes

Note: The unshift() method returns undefined in Internet Explorer!

Tip: To add new elements to the end of an array, use the push() method.


Example

Example

Add new elements to the beginning of an array, and return the new length:

<script type="text/javascript">

var fruits = ["Banana", "Orange", "Apple", "Mango"];
document.write(fruits.unshift("Kiwi") + "<br />");
document.write(fruits.unshift("Lemon","Pineapple") + "<br />");
document.write(fruits);

</script>

The output of the code above will be:

5
7
Lemon,Pineapple,Kiwi,Banana,Orange,Apple,Mango

Try it yourself »


Array Object Reference JavaScript Array Object

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