Finding greatest digit by recursion - JavaScript

We are required to write a JavaScript recursive function that takes in a number and returns the greatest digit in the number.

For example: If the number is −

45654356

Then the return value should be 6

Example

Following is the code −

const num = 45654356;
const greatestDigit = (num = 0, greatest = 0) => {
   if(num){
      const max = Math.max(num % 10, greatest);
      return greatestDigit(Math.floor(num / 10), max);
   };
   return greatest;
};
console.log(greatestDigit(num));

Output

Following is the output in the console −

6

AmitDiwan

Published on 16-Sep-2020 10:02:46

• Related Questions & Answers
• Finding difference of greatest and the smallest digit in a number - JavaScript
• Greatest digit of a number in JavaScript
• JavaScript Recursion finding the smallest number?
• Finding smallest number using recursion in JavaScript
• Finding a greatest number in a nested array in JavaScript
• Finding the nth digit of natural numbers JavaScript
• Calculating factorial by recursion in JavaScript
• Finding product of an array using recursion in JavaScript
• Finding nth digit of natural numbers sequence in JavaScript
• Finding sequential digit numbers within a range in JavaScript
• Greatest number divisible by n within a bound in JavaScript
• Is the digit divisible by the previous digit of the number in JavaScript
• Finding the group with largest elements with same digit sum in JavaScript
• Finding the largest 5 digit number within the input number using JavaScript
• Greatest Sum Divisible by Three in C++