Hello World (Clojure)

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(Clojure)

There are a lot of different ways to print "Hello World" on the console.

All functions print the same string to the console, but there are some minor differences:

The following function prints the string and appends a newline.

<<hello.clj>>=
(println "Hello World")

This function just prints the string.

<<hello.clj>>=
(print "Hello World")

This function prints the string in READable form and appends a newline.

<<hello.clj>>=
(prn "Hello World")

This function just prints the string in READable form.

<<hello.clj>>=
(pr "Hello World")

The .. macro can be used to invoke methods in Java.

This prints the string by invoking System.out.println in Java.

<<hello.clj>>=
(.. System out (println "Hello World"))

In a REPL, this prints the string by invoking the write method on the *out* PrintStream.

<<hello.clj>>=
(.. *out* (write "Hello World"))

Then again, in a REPL, the string itself can be evaluated.

<<hello.clj>>=
"Hello World"

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