<codility> Binary gap

binary_gap.rb

def solution(n)
  # n - integer to calculate binary gap on, constrained 
  raise ArgumentError.new(
    "Expected n to be an integer 'n' where 1 < n < 2,147,483,647"
  ) if !n || !n.is_a?(Integer) || n < 1 || n > 2147483647

  max_length = 0
  occurance_count = 0

  n.to_s(2).split('').each do |bit|
    if bit == "0"
      occurance_count = occurance_count + 1
    else
      if max_length < occurance_count
        max_length = occurance_count
      end
      occurance_count = 0
    end
  end

  # returns longest binary gap
  # 0 if there are no binary gaps
  max_length
end

p solution(1) # 0
p solution(15) # 0
p solution(1041) # 5
p solution(32) # 0