JavaScript length Property

Complete Array Object Reference

Definition and Usage

The length property sets or returns the number of elements in an array.

Syntax

arrayObject.length

Example

In this example we will show how to use the length property to both return and set the length of an array:

<script type="text/javascript">

var arr = new Array(3);
arr[0] = "John";
arr[1] = "Andy";
arr[2] = "Wendy";

document.write("Original length: " + arr.length);
document.write("<br />");

arr.length=5;
document.write("New length: " + arr.length);

</script>

The output of the code above will be:

Original length: 3
New length: 5

Try-It-Yourself Demos

length
In this example we will show how to use the length property.

Complete Array Object Reference

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