[Clojure] How do I use the built-in documentation or help system in Clojure?

Clojure provides a built-in documentation system called "docstring". You can use it to access the documentation for various functions, variables, and macros.

To view the documentation of a function or variable, you need to use the doc function. Here's how you can use it:

  1. Start a Clojure REPL (Read-Eval-Print Loop) by running the clojure command in your terminal.
  2. To access the documentation of a function or variable, type (doc <name>). Replace <name> with the name of the function or variable you want to get the documentation for. Press Enter.

For example, to access the documentation for the map function, you would type (doc map) and press Enter. The documentation and usage examples will be displayed in the REPL.

Here's an example session in the Clojure REPL:

 1user=> (doc map)
 4([f] [f coll] [f c1 c2] [f c1 c2 c3] [f c1 c2 c3 & colls])
 5  Returns a lazy sequence consisting of the result of applying f to
 6  the set of first items of each coll, followed by applying f to the
 7  set of second items in each coll, until any one of the colls is
 8  exhausted.  Any remaining items in other colls are ignored. Function
 9  f should accept number-of-colls arguments.

The doc function can be used to access the documentation for any function, variable, or macro in Clojure.