Scratch is actually pretty good at expressing state machines. Since all statements are atomic and all scripts on a sprite run in parallel, you can write one scr

Scratch is actually pretty good at expressing state machines. Since all statements are atomic and all scripts on a sprite run in parallel, you can write one script that says forever: wait until Today == Saturday repeat until Today != Saturday: do things outside and another script that says forever: wait until Today == Thursday repeat until Today != Thursday: if there is trash: take out the trash and then any process that updates `Today` will cause the sprite to perform the right behavior on the right day.