Episode 002: Tic-Tac-Toe, State in a Row

Functional Design in Clojure

Christoph tries to make tic-tac-toe and gets stuck on immutability.

• The REPL calculator
• Let's make a game!
• How do you keep track of the game board?
• How do you update the game board if you can't change anything?
• OO told me the "right" way to encapsulate, now what do I do?
• "Nine lines of let block, and one line of actual function."
• "The reference bucket brigade"
• reductions wants to blow your mind
• Multiple universes of tic-tac-toe, and they're all in a row!
• Time travel, for free!

Clojure in this episode:

• assoc
• assoc-in
• ->
• reduce
• reductions