Function def binary_gap(n) that, given a positive integer N, returns the length of its longest binary gap.

bin_gap.rb

def bin_gap (n)
  bin = n.to_s(2)
  temp = []
  gaps = []
  bin.each_char do |char|
    if char == "1"
      unless temp.empty?
        gaps << temp.length
        temp = []
      end
    else
      temp << char
    end
  end
  return 0 if gaps.empty?
  gaps.max
end