Part III — State and rules

The grid now has a precise value behind it. The game state is deliberately small: played cells, whose turn it is, and whether play is active or done.

(ns+
  (:require [studio.draw :as draw]))

(defn new-game []
  {:board {:p1 #{} :p2 #{}}
   :turn :p1
   :status :active})

next-move receives a game value and a cell. It returns a new game only when the move is legal. Win and draw detection belong beside it: they are rules, not canvas behaviour.

Practical — make a state change visible

Edit the starting :turn to :p2, run the file, and inspect the returned value. Then add one occupied cell to :p1. This is the core loop in miniature: write a value, evaluate it, inspect the next value.

Continue: pointer input →{ .md-button .md-button—primary }