determine the sum of al digits of n

1def sum_of_digits(n): 
2	sum = 0
3	while (n != 0): 
4		sum = sum + int(n % 10) 
5		n = int(n/10) 
6	return sum

1function digSum(n) {
2    let sum = 0;
3    let str = n.toString();
4    console.log(parseInt(str.substring(0, 1)));
5    for (let i = 0; i < str.length; i++) {
6        sum += parseInt(str.substring(i,i+1));
7        
8    }
9    return sum;
10}