Given Length and Sum of Digits... code example

Example 1: Write a function digitsum that calculates the digit sum of an integer. The digit sum of an integer is the sum of all its digits.

function digSum(n) {
    let sum = 0;
    let str = n.toString();
    console.log(parseInt(str.substring(0, 1)));
    for (let i = 0; i < str.length; i++) {
        sum += parseInt(str.substring(i,i+1));
        
    }
    return sum;
}

Example 2: sum the digits of an integer

def getSum(n)
  n.digits.sum
end

print "Sum of digits = ", getSum(555);