How to sort a javascript array of numbers

Question

I need to sort an array in javascript..

anyone how to do that??

by default the sort method doesn't work with numbers...

I mean:

a = [1, 23, 100, 3]
a.sort()

a values are:

[1, 100, 23, 3]

thanks :)

`a.sort(function(a,b){return a-b;})` [Here's a link](https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/sort) to some docs. You should become accustomed to doing research on your own. It will only help you. — , Feb 24 '12 at 22:15

score 15 · Accepted Answer · answered Feb 24 '12 at 22:15

15

Usually works for me:

a.sort(function(a,b){ 
  return a - b;
});

answered Feb 24 '12 at 22:15

raina77ow

99,006
14
190
222

Concise and to the point using simple maths and `>1 = 1 && – Alexander Varwijk Feb 24 '12 at 22:16

Andrés Torres Marroquín · Answer 2 · 2012-02-24T22:21:10.003

3

So if you write the sorting function, it will work.

[1, 23, 100, 3].sort(function(a, b){
    if (a > b)
        return 1;
    if (a < b)
        return -1;
    return 0
});

edited Feb 24 '12 at 22:21

answered Feb 24 '12 at 22:14

Andrés Torres Marroquín

1,934
14
14

3

Note, the comparison function can return any value it likes -- only the sign is important. So the whole function could be reduced to `return a - b;`. – cHao Feb 24 '12 at 22:15
You are right. This a general purporse solution. – Andrés Torres Marroquín Feb 24 '12 at 22:17

score 1 · Answer 3 · answered Feb 24 '12 at 22:14

1

<script type="text/javascript">

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

var n = ["10", "5", "40", "25", "100", "1"];
document.write(n.sort(sortNumber));

</script>

answered Feb 24 '12 at 22:14

Sid

7,315
2
26
41

score 0 · Answer 4 · answered Feb 24 '12 at 22:17

0

You can pass in a comparator function to sort.

> a.sort(function(a, b) { return a < b ? -1 : a > b ? 1 : 0; });
  [1, 3, 23, 100]

answered Feb 24 '12 at 22:17

fent

17,491
15
84
90

score -1 · Answer 5 · answered Feb 24 '12 at 22:16

-1

Use a custom sort function.

a = [1, 23, 100, 3];
a.sort(function(a,b){ return a-b; });

answered Feb 24 '12 at 22:16

ObscureRobot

7,168
2
26
35

score -2 · Answer 6 · edited Jan 28 '19 at 14:34

Here is a solution to sort a Javascript array in ascending order

function bubblesort(array){

    var done = false;
    while(!done){
        done = true;
        for(var i = 1; i< array.length; i++){
            if(array[i -1] > array[i]){
                done = false;
                var tmp = array[i-1];
                array[i-1] = array[i];
                array[i] = tmp;
            }
        }
    }
    return array;
}
var numbers = [2, 11, 1, 20, 5, 35];
bubblesort(numbers);

How to sort a javascript array of numbers

6 Answers6

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