Namespaces are a feature that allows the categorization of functions, symbols, and variables into well-defined groups. Later on in this chapter we’ll see that namespaces can also be translated and mapped to an actual file system directory structure.
Let’s start by using the REPL to demonstrate a simple example of how namespaces work. When we run lein repl we’re automatically dropped into a new user namespace, and that namespace is pre-loaded with the Clojure core library. You can tell what namespace you’re in by looking at the REPL console, which displays the current namespace just before your cursor ...
