12. Concurrency

Activity 12.01: A DOM Whack-a-mole Game

Solution:

1. Create a project with lein figwheel:

   lein new figwheel packt-clj.dom-whackamole -- --rum

2. Move to the new packt-clj.dom-whackamole directory and start a ClojureScript REPL:

   lein figwheel

   In your browser, at localhost:3449/index.html, you should see the default Figwheel page:

   Figure 12.26: Default Figwheel page

3. Open dom-whackamole/src/packt-clj/dom-whackamole/core.cljs in your editor or IDE. This is where you will write all the remaining code.
4. Define the atoms that will determine the game's state:

   (def game-length-in-seconds 20)
   (def millis-remaining (atom (* game-length-in-seconds 1000)))
   (def points (atom 0))
   (def game-state (atom :waiting))
   (def clock-interval (atom nil))
   (def moles (atom (into []
               (repeat 5 {:status :waiting
                    ...