javascript right trim

1//use trim() on your string. It removes first and last whitepsaces
2
3let str = " aa bb    ";
4console.log(str.trim()); // "aa bb"

1function rtrim(str, ch)
2{
3    for (i = str.length - 1; i >= 0; i--)
4    {
5        if (ch != str.charAt(i))
6        {
7            str = str.substring(0, i + 1);
8            break;
9        }
10    } 
11    return str;
12}