snail.rb

# https://www.codewars.com/kata/snail

def snail(matriz)
  result = []
  step = 0
  while matriz.size > 0
    step = 0 if step > 3
    case step
      when 0
        result += matriz.shift
      when 1
        result += matriz.map{ |x| x.pop }
      when 2
        result += matriz.pop.reverse
      when 3
        result += matriz.map{ |x| x.shift }.reverse
    end
    step += 1
  end
  result
end