module Validation
  DIFFICULTS = {
    easy: 'easy',
    medium: 'medium',
    hell: 'hell'
  }.freeze

  def name_valid?(name)
    name.length.between? 3, 20
  end

  def guess_valid?(guess)
    /^[1-6]{4}$/.match? guess
  end

  def difficult_valid?(difficult)
    DIFFICULTS.values.include? difficult.downcase
  end
end