sort Method (Array) (JavaScript)

Sorts an Array.




Required. Any Array object.

Optional. The name of the function used to determine the order of the elements. If omitted, the elements are sorted in ascending, ASCII character order.

Return Value

The sorted array.


The sort method sorts the Array object in place; no new Array object is created during execution.

sortFunction takes two arguments and must return one of the following values:

  • A negative value (less than 0) if the first argument passed is less than the second argument. The first argument is sorted to a lower index.

  • Zero (0) if the two arguments are equivalent. The two arguments are sorted with respect to other elements in the array, but are not sorted with respect to each other.

  • A positive value (greater than 0) if the first argument is greater than the second argument. The second argument is sorted to a lower index.


The following example shows how to use the sort method.

var a = new Array(4, 11, 2, 10, 3, 1);  

var b = a.sort();  

// This is ASCII character order.  
// Output: 1,10,11,2,3,4)  

// Sort the array elements with a function that compares array elements.  
b = a.sort(CompareForSort);  
// Output: 1,2,3,4,10,11.  

// Sorts array elements in ascending order numerically.  
function CompareForSort(first, second)  
    if (first == second)  
        return 0;  
    if (first < second)  
        return -1;  
        return 1;   


Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards, Internet Explorer 11 standards. Also supported Store apps (Windows 8 and Windows Phone 8.1). See Version Information.