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JavaScript sort() Method

Array Object Reference JavaScript Array Object

Definition and Usage

The sort() method is used to sort the elements of an array.

Syntax

arrayObject.sort(sortby)

Parameter Description
sortby Optional. Specifies the sort order. Must be a function

Tips and Notes

Note: The sort() method will sort the elements alphabetically by default. However, this means that numbers will not be sorted correctly (40 comes before 5). To sort numbers, you must create a function that compare numbers.

Note: After using the sort() method, the array is changed.

Examples

Example 1

Create an array, and sort it alphabetically:

<script type="text/javascript">

var arr = new Array(6);
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";
arr[5] = "Tove";

document.write(arr + "<br />");
document.write(arr.sort());

</script>

The output of the code above will be:

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

Try it yourself »

Example 2

Create an array (with numbers), and sort it correctly:

<script type="text/javascript">

function sortNumber(a,b)
{
return a - b;
}

var arr = new Array(6);
arr[0] = "10";
arr[1] = "5";
arr[2] = "40";
arr[3] = "25";
arr[4] = "1000";
arr[5] = "1";

document.write(arr + "<br />");
document.write(arr.sort(sortNumber));

</script>

The output of the code above will be:

10,5,40,25,1000,1
1,5,10,25,40,1000

Try it yourself »

Array Object Reference JavaScript Array Object

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