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Clojure gives you some tools for learning about what functions and variables are available in the loaded namespaces. You can look up their documentation and their source code.
Running a Clojure repl in a Java application
One of the cool things about Clojure is that it is hosted. That means it has access to the underlying platform in intimate ways. One thing you can do with that is run a Clojure repl inside of your JVM. You have access to all of the JVM stuff, but through a language that is more conducive to interactive programming. In this lesson, we look at four ways of running a repl you can connect to. Two ways are within Java projects themselves.