326. 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

 

Constraints:

• -231 <= n <= 231 - 1

 

Follow up: Could you solve it without loops/recursion?

Solution:

In JS:

var isPowerOfThree = function(n) {

    let result = false;

    let numOfSqrt = parseInt(Math.sqrt(n))+1;

    for(let index = 0; index<=numOfSqrt; index++){

      let power = Math.pow(3, index);

      if(n === power) result = true;

      else result;

    }

    return result;

};