Check for Ugly number in JavaScript

In the decimal number system, ugly numbers are those positive integers whose only prime factors are 2, 3 or 5.

For example − Integers from 1 to 10 are all ugly numbers, 12 is an ugly number as well.

Our job is to write a JavaScript function that takes in a Number and determines whether it is an ugly number or not.

Let's write the code for this function −

Example

const num = 274;
const isUgly = num => {
   while(num !== 1){
      if(num % 2 === 0){
         num /= 2;
      } else if(num % 3 === 0) {
         num /= 3;
      } else if(num % 5 === 0) {
            num /= 5;
      } else {
         return false;
      };
   };
   return true;
};
console.log(isUgly(num));
console.log(isUgly(60));
console.log(isUgly(140));

Output

The output in the console will be −

false
true
false