Listing Arrays in Ascending order

How do I rearrange an array of numbers in ascending order of value in JavaScript?

Thanks,
Mike

 

you need to create an alternate sorting function and use it with the sort method. like this:

     
     <script type="text/javascript">
    	var arr=[7,5,3,1];
    	arr.sort(function(a,b) {return a-b});
	document.write(arr);
     </script>

Code (markup):

The function created on line 2 returns a value to the sort method for each two numbers that it is comparing (a and b), a negative return value means a is lower then b, a positive return value means a is higher then b, and 0 means the two are equal. This allows the sort method to sort the values accordingly.

You can change this to descending by changing:
arr.sort(function(a,b) {return a-b});
to:
arr.sort(function(a,b) {return b-a});

 

Thanks camjohnson95. Very good explanation of the sort function, that will come in handy in the future. However I asked for the wrong thing.
I asked how to rearrange an array of numbers but what I actually wanted to do is keep them in the same order but output (document.write) them in ascending order. E.g. My array would be myArray=[5,2,6,1]. I want to keep them stored in this order, but to ouptut them as 1,2,5,6.

The reason for this is I have an array of numbers and an array of names and they correspond to eachother. Obviously if I rearrange the numbers then the names will not correspond to the correct number.

Thanks,
Michael

 

     <script type="text/javascript">
             var arr=[7,3,5,1,8];
	var arr2 = arr.concat();
	arr2.sort(function(a,b) {return a-b});
	document.write("Original: " + arr);
	document.write("<br>Sorted: " + arr2);
     </script>

Code (markup):

 

alternatively you could have the name values and number values stored in the same array:

     <script type="text/javascript">
        var arr = [{n: "Name1", num: 6},{n: "Name2", num: 3},{n: "Name3", num: 9},{n: "Name4", num: 5}];
        arr.sort(function(a,b){return a.num-b.num});
        for(i=0; i<arr.length;i++) {
            document.write("Name: " + arr[i].n + "<br>");
            document.write("Number: " + arr[i].num + "<br>");
        }   
     </script>

Code (markup):