Sum up all digits of a number until it becomes one digit
Learn how to sum up all digits of a number until it becomes one digit in JavaScript.
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const num = 987654;
const sumAllDigits = (num, sum = 0) => {
if(num){
return sumAllDigits(Math.floor(num / 10), sum + (num % 10));
};
return sum;
};
const recursiveSum = (num) => {
if(num > 9){
return recursiveSum(sumAllDigits(num));
};
return num;
};
console.log(recursiveSum(num)); //3
