I'm trying to square each number in an array and my original code didn't work. I looked up another way to do it, but I'd like to know WHY the original code didn't work.

Original code:

function(arr) {



    ret= [];            



    for (var i = 0, len = arr.length; i < len; i++) {

        root = Math.sqrt(arr[i]);

        ret.push(root);

    }



    return ret;

}

Working Code:

function(arr) {



    ret= [];



    for (var i = 0, len = arr.length; i < len; i++) {

        ret.push(arr[i] * arr[i]);

    }



    return ret;     

}