How to sort array in javascript?

Question

var arr = [];
arr.push(row1);
arr.push(row2);
...
arr.push(rown);

How to sort by row['key']?

Answer 1

A JavaScript array has a built-in sort() method. In this case, something like the following would work:

arr.sort( function(row1, row2) {
    var k1 = row1["key"], k2 = row2["key"];
    return (k1 > k2) ? 1 : ( (k2 > k1) ? -1 : 0 );
} );

Answer 2

You call the sort function of an array with your comparator. A JavaScript comparator is just a function that returns -1, 0, or 1 depending on whether a is less than b, a is equal to b, or a is greater than b:

myarray.sort(function(a,b){
    if(a < b){
        return -1;
    } else if(a == b){
        return 0;
    } else { // a > b
        return 1;
    }
});

This is just an example, your function can base the comparison on whatever you want, but it needs to return -1,0,1.

Hope this helps.