card.rb

class Card # creating a single card object
    VALUES = ("A".."Z").to_a

    def self.shuffled_pairs(num_pairs)
        values = VALUES

        while num_pairs > values.length
            values = values + values
        end

        values = values.shuffle.take(num_pairs) * 2
        values.shuffle!
        values.map { |val| self.new(val) }
    end

    attr_reader :value

    def initialize(value, revealed = false) 
        @value = value
        @revealed = revealed
    end

    def hide
        @revealed = false
    end

    def reveal
        @revealed = true
    end

    def to_s
        revealed? ? value.to_s : " " 
    end

    def revealed?
        @revealed
    end

    def ==(object)
        object.is_a?(self.class) && object.value == value
    end

end