数组排序并插入值算法挑战

function where(arr, num) {
// Find my place in this sorted array.
    arr.push(num);
    var len = arr.length;
    while(len > 0){
        for(var j = 0; j < len - 1; j++){
            var max = 0;
            if(arr[j] > arr[j+1]){
                max = arr[j];
                arr[j] = arr[j+1];
                arr[j+1] = max;
            }
        }
        len --;
    }
    return arr.indexOf(num);
}


where([40, 60], 50);