powerofThree.js

////////////////////////////////////////////////Power of Three///////////////////////////////////////////
// Given an integer n, return true if it is a power of three. Otherwise, return false.
// An integer n is a power of three, if there exists an integer x such that n == 3x.
// Example 1:
// Input: n = 27
// Output: true
// Example 2:
// Input: n = 0
// Output: false
// Example 3:
// Input: n = 9
// Output: true
// Example 4:
// Input: n = 45
// Output: false
/**
 * @param {number} n
 * @return {boolean}
 */
 const isPowerOfThree = function(n) {
    if(n === 3 || n === 1) return true;
    if(n < 3) return false;

    return isPowerOfThree(n / 3);
};

// console.log(isPowerOfThree(27));
// console.log(isPowerOfThree(0));
// console.log(isPowerOfThree(9));
// console.log(isPowerOfThree(45));