I created this Blackjack program as a first attempt at Ruby. Would appreciate a code review to see if I am doing things the Ruby way (is there a better way to get user input?), using OOP correctly and anything else you want to point out.
class Card
def initialize(suit, face_value)
@suit = suit
@face_value = face_value
end
def get_value
card_value = [@suit, @face_value]
end
end
class Deck
def initialize(number_of_decks = 1)
@deck = create_deck(number_of_decks)
end
def draw(number_of_cards = 1)
drawn_cards = []
number_of_cards.times do
drawn_cards << @deck.pop()
end
return drawn_cards
end
def size
@deck.size
end
private
def create_deck(number_of_decks)
suite = [:Spades, :Clubs, :Hearts, :Diamonds]
face_value = (2..10).to_a
face_value << :Jack << :Queen << :King << :Ace
deck = []
number_of_decks.times do
suite.each do |s|
face_value.each do |v|
card = Card.new(s, v)
deck << card
end
end
end
deck.shuffle!
return deck
end
end
class Player
attr_reader :score
attr_reader :funds
attr_reader :bet
attr_reader :hand
def initialize
@hand = [];
@score = 0;
@bet = 0;
@funds = 1000;
end
def reset
@hand = [];
@score = 0;
@bet = 0;
end
def hand(cards)
@hand += cards
calculate_score
end
def place_bet
amount = 0
while true
begin
amount = Integer(gets)
if amount <= @funds && amount > 0
@bet += amount
@funds -= amount
break
elsif amount > @funds
puts "Sadly, you don't have enough funds to place this bet. Please enter a lower bet."
else
puts "You cannot place a zero or negative bet."
end
rescue
puts "Please enter a valid whole amount."
end
end
end
def update_funds(amount)
@funds += amount
end
def calculate_score
@score = 0
ace_in_hand = false
@hand.each do |h|
face_value = h.get_value[1]
if face_value.is_a? Integer
@score += face_value
elsif face_value != :Ace
@score += FACEVALUE
else
# Its an ace so could be 11 or 1?! However, only one ace could be counted as 11 (as 11 + 11 = 22 and would lose). Record if there is an ace in the hand and add one to the score.
@score += 1
ace_in_hand = true
end
end
if ace_in_hand
if @score + FACEVALUE <= BLACKJACK then @score += FACEVALUE end
end
end
def print_hand
hand_as_string = ""
@hand.each do |card|
card_value = card.get_value
hand_as_string += "#{card_value[0]}, #{card_value[1]} | "
end
return hand_as_string
end
end
def determine_winner(player, dealer)
amount = 0
if dealer.score > BLACKJACK && player.score > BLACKJACK
puts "\n**No one wins!**\n"
elsif player.score < dealer.score && dealer.score <= BLACKJACK ||
player.score > BLACKJACK
puts "\n***Dealer wins***\n"
elsif dealer.score < player.score && player.score <= BLACKJACK ||
dealer.score > BLACKJACK
puts "\n****Player wins!****\n"
# increase funds to player and check for blackjack
if player.score == BLACKJACK && player.hand.size == 2
amount = player.bet + player.bet * 1.5
else
amount = player.bet * 2
end
else
puts "\nIt's a draw!\n"
# return funds to player
amount = player.bet
end
player.update_funds(amount)
end
# define blackjack winning score and value of face card
BLACKJACK = 21;
FACEVALUE = 10;
DEALER_STANDS_AT = 17;
puts "Welcome to blackjack!"
puts "You currently have $1000 in funds. Blackjack pays 3:2"
puts "How many decks should we use? (Integer between 1 and 10)"
number_of_decks = -1
while number_of_decks == -1
begin
number_of_decks = Integer(gets)
if number_of_decks <= 0 || number_of_decks > 10
number_of_decks = -1
puts "The number of decks must be between 1 and 10."
end
rescue
puts "Please enter a valid integer"
end
end
keep_playing = true
# Create the players and dealer
player = Player.new
dealer = Player.new
while keep_playing
# Create a new deck
deck = Deck.new(number_of_decks)
# Reset the players and dealers score and hand, and the players bet
player.reset
dealer.reset
# Ask player to place bet
puts "How much would you like to bet?"
player.place_bet
# Deal two cards to each player and one card to the dealer
player.hand(deck.draw(2))
dealer.hand(deck.draw)
puts "\nYour current hand is: #{player.print_hand} \nYour score is: #{player.score}\n."
puts "The dealer's hand is: #{dealer.print_hand}\nThe dealers score is: #{dealer.score}\n"
# Deal the dealers second card (that is unknown to the player)
dealer.hand(deck.draw)
if dealer.score != BLACKJACK
# until player is not bust or stands
until player.score > BLACKJACK do
puts "\nDo you want to hit (h) or stand (s)?"
players_move = String(gets)
case players_move[0].downcase
when "s"
# stand
break
when "h"
# hit
puts "\nYou decided to hit!\n"
player.hand(deck.draw)
puts "\nYour hand is #{player.print_hand}\nYour score is: #{player.score}."
else
puts "Unknow input. Please try again.\n"
end
end
puts "\nYour move has ended, resolving the dealers hand.\n"
# Resolve the dealers hand (keep drawing cards until bust or >=17 reached)
while dealer.score <= DEALER_STANDS_AT
dealer.hand(deck.draw)
end
puts "\nThe dealer's hand is #{dealer.print_hand} \nThe dealers score is: #{dealer.score}"
end
# Determine the winner(s) and resolve any ties and settle all the bets
determine_winner(player, dealer)
puts "At the end of the game your funds stand at $#{player.funds}."
# Ask if player wants to play again?
while true
puts "Do you want to play again? (Y/N)"
play_again = String(gets)
case play_again[0].downcase
when "y"
break
when "n"
keep_playing = false
break
end
end
end
