How can i sort a multi-dimensional array by Number

Question

I want to sort the Array by Id

var arr = [{"name":"a", "id":"2"}, {"name":"r", "id":"11"}, {"name":"y", "id":"23"}, {"name":"e", "id":"1"}];

I am using following code

function compareNum(a,b) {
          if (a.id < b.id)
          {
              return -1;
          }
          if (a.id > b.id)
          {
              return 1;
          }

          return 0;
}

Answer Sorting: 1, 11, 2, 23

But I need: 1,2,11,23

Answer 1

You need to use parseInt() to convert each id from a string to an integer.

Answer 2

Just add some parseInt() and it will work:

function compareNum(a, b) {
    if (parseInt(a.id) < parseInt(b.id)) {
        return -1;
    }
    if (parseInt(a.id) > parseInt(b.id)) {
        return 1;
    }
    return 0;
}

Demo

--

But actually a simplified version would also work:

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

Demo

Answer 3

You can use the predefined sort() JavaScript function:

arr = arr.sort(function(current, next){
    return current.id - next.id;
});

See a demo online here: http://jsfiddle.net/5J8kk/3/

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Source: https://stackoverflow.com/a/13171179/1505348