🥷 Clojure Pro Tip 1: the Discard Reader Symbol

In Clojure, we can use comment (aka Rich Comment Blocks) for tests or experiments in development. However, since a comment evaluates to nil, you may run into surprising results or even errors if you misuse it. Comment vs. Discard In these scenarios, you may tend to use ; to comment them out, but a better choice is to use the discard reader symbol #_ .