Clojure source code appears in monospaced font, like this:
(ns my-project.core)
(defn add
[x y]
(+ x y))When a Clojure expression is evaluated for a return value, that value is denoted with a comment followed by an arrow, like this:
(add 1 2)
;; -> 3|
Note
|
Comments in Clojure start with a single semicolon. By convention, comments with two semicolons explain the preceding expression and are left-aligned to the same indentation level. Comments with a single semicolon are typically used for the right-hand margin, on the same line as the code being commented. Three semicolons or more are used for top-level section and file headers. |
When an expression produces output, it is denoted by a comment
containing out followed by a comment with each line of output.
(do (println "Hello!") (println "Goodbye!"))
;; -> nil
;; *out*
;; Hello!
;; Goodbye!REPLs (Read-Eval-Print Loop) are interactive prompts that evaluate expressions and print the result. The Bash prompt, irb, and the python prompt are examples of REPLs.
A Clojure REPL session is denoted by a monospace font with a prompt that includes the current namespace and a ">" symbol, indicating the point where you should type your code. Output and return values appear after the prompt.
user> (map str [4 5 6])
("4" "5" "6")
user> (println "Hello")
Hello
nil
user>
Console sessions (e.g. shell commands) are denoted by monospace font, with lines beginning with a dollar sign ($) indicating a shell prompt. Output is printed without a leading "$".
A backslash (\) at the end of a command line indicates a single command that continues on the next line.
$ lein version
Leiningen 2.0.0-preview10 on Java 1.6.0_29 Java HotSpot(TM) 64-Bit Server VM