231. Power of Two

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

An integer n is a power of two, if there exists an integer x such that n == 2x.

Example 1:

Input: n = 1
Output: true
Explanation: 20 = 1

Example 2:

Input: n = 16
Output: true
Explanation: 24 = 16

Example 3:

Input: n = 3
Output: false

Example 4:

Input: n = 4
Output: true

Example 5:

Input: n = 5
Output: false

Constraints:

• -231 <= n <= 231 - 1

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

# @param {Integer} n
# @return {Boolean}

def is_power_of_two(n)
  return false if n <= 0
  return true if n == 1
  n.to_s(2).count('1') == 1 ? true : false
end