jaymoid/BlackJack

coding kata for a simple game of blackjack

Steve Mellor's blackjack challenge

The challenge: build a simple 1 player blackjack game that runs in a terminal.

The gameplay should do the following:

• Shuffle the cards.
• Deal two to the human, two to the dealer.
• Human goes first with stick or twist options.

Scoring

• picture cards are 10,
• ace is 1 or 11.
• over 21 is bust.
• once you stick, it’s over to the dealer who always sticks on 17+.
• winner is closest to 21 without going over.

Stick logic (as described by Anthony)

If the player score > dealer score, and the dealer score < 17, they have to take a card. If the player score > dealer score, and dealer score >= 17, the dealer sticks and the player wins.

If the dealer score = player score, and this score < 17, the dealer has to hit again If the dealer score = player score, and the score is >= 17, then the game is a draw

If the player score < dealer score, the dealer stands and wins

My implementation details

• Kotlin
• No mutable variables (vars)
• No mutable state/collections
• TDD all the things
• Functional core / functional shell
• Derive meaning through types and type signatures
• No functions that blow up at runtime (e.g. list.first() on an empty list)