Clojure: High Performance JVM Programming

Getting started with Clojure code and data

Let's take a deep dive into Clojure's syntax now, it is pretty different from other languages but it is actually much simpler. Lisps have a very regular syntax, with few special rules. As we said earlier, Clojure code is made of S-expressions and S-expressions are just lists. Let's look at some examples of lists to become familiar with lists in Lisp.

(1 2 3 4)
(println "Hello world")
(one two three)
("one" two three)

All of the above are lists, but not all of them are valid code. Remember, only lists where the first element is a function can be considered valid expressions. So, here only the following could be valid expressions:

(println "Hello world")
(one two three)

If println and one are defined as functions. ...