States: Idle, Running, Sleeping

Game characters live in states. A pet might be idle, then running, then sleeping — and the state decides what it does next.

1. 1List the states

   Store the states in an array.

   let states = ["idle", "run", "run", "sleep"]

2. 2Add the pet

   Create a dog.

3. 3Act on state

   Loop over the states and do something different for each one.