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Blackjack

Setup

This project was built with Ruby 2.6.1 with RSpec 3.8.0.

Download the repo and run bundle install.

To run the game simulation, run ruby game.rb. This will simulate a single round of simplified Blackjack where you play against the dealer (the computer).

Specs

To run the specs, run bundle exec rspec.

Assumptions

This is a simplified version of Blackjack.

The following assumptions were made:

  • A Game includes a single Player (the user) and one Dealer (the computer)
  • A Game involves only one Deck (some casino blackjack games utilize a "shoe" of 6 decks)
  • The Game currently simulates only a single round
  • There is no betting
  • There is no "splitting", "insurance", or "doubling down"

Solution

The following illustrates the ways in which this solution satisfies the requirements listed in the original instructions:

  • As a Player I can get a hand with two cards in it
player = Player.new
deck   = Deck.new
2.times { player.deal(deck.draw!) }
  • As a Dealer I can get a hand with two cards in it
dealer = Dealer.new
deck   = Deck.new
2.times { dealer.deal(deck.draw!) }
  • As a Player I can see what card the dealer is showing
game = Game.new
game.deal
game.render.table(show_dealers_hand: false)
  • As a Player I can bust (lose immediately) when I am getting cards
player = Player.new
player.deal(Card.new(:hearts, :ten, 10))
player.deal(Card.new(:hearts, :ten, 10))
player.hit(Card.new(:hearts, :two, 2))
player.bust?
=> true
  • As a Player I can blackjack (win immediately) when I am dealt cards (this is a simplification)
player = Player.new
player.deal(Card.new(:hearts, :ten, 10))
player.deal(Card.new(:hearts, :ace, [1, 11]))
player.blackjack?
=> true
  • As a Dealer I can draw cards after the player until I win or lose
    • This logic is implemented in Game#dealer_sequence

Original Instructions

Simplified Blackjack

blackjack.rb contains initial work on a Blackjack simulation.

Your implementation should satisfy the following use cases and Blackjack rules:

  • As a Player I can get a hand with two cards in it
  • As a Dealer I can get a hand with two cards in it
  • As a Player I can see what card the dealer is showing
  • As a Player I can bust (lose immediately) when I am getting cards
  • As a Player I can blackjack (win immediately) when I am dealt cards (this is a simplification)
  • As a Dealer I can draw cards after the player until I win or lose

Rules:

  • Bust - Occurs when all possible hand values are greater than 21 points
  • Blackjack - Occurs when a player or dealer is dealt an ace and a 10-point card
  • Dealer - Stays on 17 or above

Please use your discretion in fixing/adding tests. You are free to use/convert to any testing framework you want.

Optional:

  • Simulate a random round of the game (you don't have to write educated player decision logic - it could be just guesses)

For more information on blackjack, please refer to its wiki page.