#342 - Power of Four

Easy • View on LeetCode • View on GitHub

Problem Description

Given an integer n, return true if it is a power of four. Otherwise, return false.

An integer n is a power of four, if there exists an integer x such that n == 4x.

Solution

/**
 * @param {number} n
 * @return {boolean}
 */
var isPowerOfFour = function(n) {
  if (n > 1) {
    while (n % 4 === 0) {
      n /= 4
    }
  }
  return n === 1;
};