Clojure Basics: How code is evaluated

An explanation of Clojure's evaluation model, symbols, vars, namespaces, and how to keep files and the REPL in sync.

I cover the bare basics of Clojure's evaluation model and how it helps us write code at the REPL. I also go over some possible issues and stumbling blocks. clojure.tools.namespace library — github.com/clojure/tools.namespace Clojure Community: Where to ask for Help — practicalli.github.io/blog/posts/cloure-community-getting-he… Clojure evaluation reference — clojure.org/reference/evaluation Discuss on Reddit — reddit.com/r/Clojure/comments/hzataf/clojure_basics_how_code… Chapters: 0:00 Intro 0:28 Symbols, Vars and Namespaces 5:28 How def and defn work 8:03 How Clojure code is evaluated 15:20 Compiled functions refer to Vars 17:45 What happens when a file is loaded in the REPL 20:12 Keeping files and the REPL in sync 27:02 Changing code in libraries 29:03 Why ring-jetty needs to be restarted 34:41 How to avoid restarting ring-jetty 37:43 Outro