- Trending Categories
- Data Structure
- Networking
- RDBMS
- Operating System
- Java
- MS Excel
- iOS
- HTML
- CSS
- Android
- Python
- C Programming
- C++
- C#
- MongoDB
- MySQL
- Javascript
- PHP
- Physics
- Chemistry
- Biology
- Mathematics
- English
- Economics
- Psychology
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Calculating the sum of digits of factorial JavaScript
We are required to write a JavaScript function that takes in a number. The function should first calculate the factorial of that number and then it should return the sum of the digits of the calculated factorial.
For example −
For the number 6, the factorial will be 720, so the output should be 9
Example
const factorial = (num) => { if (num == 1) return 1; return num * factorial(num-1); }; const sumOfDigits = (num = 1) => { const str = num.toString(); let sum = 0; for (var x = -1; ++x < str.length;) { sum += +str[x]; }; return sum; }; const sumFactorialDigits = num => sumOfDigits(factorial(num)); console.log(sumFactorialDigits(6));
Output
This will produce the following output −
9
Advertisements