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Repeated sum of Number’s digits in JavaScript
We are required to write a JavaScript function that recursively sums up the digits of a number until it reduces to a single digit number.
We are required to do so without converting the number to String or any other data type.
Therefore, let’s write the code for this function −
Example
The code for this will be −
const num = 546767643; const sumDigit = (num, sum = 0) => { if(num){ return sumDigit(Math.floor(num / 10), sum + (num % 10)); } return sum; }; const sumRepeatedly = num => { while(num > 9){ num = sumDigit(num); }; return num; }; console.log(sumRepeatedly(num));
Output
The output in the console will be −
3
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