tdeo

class Mastermind
  COLOURS = 'A'.upto('Z').to_a

  def initialize(colour_count = 6, size = 4)
    fail "Size must be <= #{COLOURS.size}" unless size <= COLOURS.size
    @size = size
    @colours = COLOURS.first(colour_count)
    @code = size.times.map { @colours.sample }
    @moves = 0
    puts "Guess the code, size #{@size}, letters are (#{@colours.join(', ')})"

tdeo

# Memoization made easy. Use it the following way
#
# Memoize all calls
# memoize def my_function(n)
#   ...
# end
#
# Memoize only a ratio of calls (5% here):
# memoize 0.05 def my_function(n)
#   ...