bubble sort

var arr = [8, 2, 6, 1, 5, 4];
 
for (var i = 0; i < arr.length - 1; i++){
    for (var j = 0; j < arr.length -1; j++) {
        if (arr[j] > arr[j + 1]) {
 
            var tempVar1 = arr[j];
            var tempVar2 = arr[j + 1]; 
 
            //swap places
            arr[j]     = tempVar2;
            arr[j + 1] = tempVar1;
        }
    }
}
alert(arr.join(","))