Quick deck of cards in JSON.

json_deck.rb

#Build a deck of cards in json
require 'json'

class Card
   attr_reader :value, :suit
   def initialize(val,suit)
      @value = val
      @suit = suit
   end

   def to_json
      {'value' => @value, 'suit' => @suit}
   end
end

deck = []
cards = ['A', '9', '10', 'J', 'Q', 'K']
suit = ['S', 'C', 'H', 'D']

cards.product(suit).each do |value, suit2|
   deck << Card.new(value,suit2).to_json
end

puts JSON.pretty_generate(deck)

Note that this is just for A-K