Write A Function To Determine If A Number Is A Power Of 2

poweroftwo.rb

def power_of_2?(number)
 return false if number == 0
 while(number % 2 == 0)
   number = number / 2
 end
 return false if number > 1
 true
end


def power_of_2?(number)
 return true if number == 1
 return false if number == 0 || number % 2 != 0
 power_of_2?(number / 2)
end



def power_of_2?(number)
 number != 0 && number & (number - 1) == 0
end


def power_of_two(number)
result = Math.log(number) / Math.log(2)
result - result.floor == 0
end


def test(x)
   return ( x & (x -1 )) == 0
end