#263 - Ugly Number

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Problem Description

Write a program to check whether a given number is an ugly number.

Ugly numbers are positive numbers whose prime factors only include 2, 3, 5.

Solution

/**
 * @param {number} num
 * @return {boolean}
 */
var isUgly = function(num) {
  for (let i of [2, 3, 5]) {
    while (num && num % i === 0) num /= i;
  }
  return num === 1;
};