Web Development with Clojure, 3rd Edition

Events and Effects in Re-Frame

Now that we have our WebSockets layer all set up, let’s get the rest of our re-frame stuff in order. Earlier, we accomplished the goal of making our application’s view a computation of our app-db. Now, we want to go a step further and make sure that we properly separate events from effects.

Until now, we’ve been writing event handlers by using re-frame’s built-in effects (for example, :db, :dispatch, and so on) and calling effectful functions where built-in effects fall short. We’ve gotten pretty far with this approach, but we need to improve this sooner or later. As we discussed earlier, re-frame’s distinction between events and effects is crucial.

The Value of Isolating Effects

Our ultimate goal in using re-frame ...