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Co-effects are the impure data your Event Handlers need to run. This might include the current value of the Database, the current time, or even a value stored in LocalStorage.
Code is available: lispcast/understanding-re-frame
Code for this particular lesson is available at the
You can checkout the code in your local repo with this command:
$CMD git clone https://github.com/lispcast/understanding-re-frame.git $CMD cd understanding-re-frame $CMD git checkout -f 020
Interceptors are an "advanced" concept. You can go a long way without using interceptors. However, they're very useful for cross-cutting concerns. My recommendation is to watch this lesson now, but not to worry if it doesn't seem useful yet. If you need it later, you'll know it's there.