Clojure is a language that is rather different from the other languages covered in this book. It is a language largely inspired by the Lisp programming language, which originally dates back to the late 1950s. Lisp stayed relevant by being up to date with both technology and times. Common Lisp and Scheme are arguably the two most popular Lisp dialects in use today. Clojure is a dialect of Lisp, but its design is influenced by both.
Unlike Java and Scala, Clojure is a dynamic language. Variables do not have fixed types and when compiling, no type checking is performed by the compiler. When a variable is passed to a function that is not compatible with the code in the function, an exception will be thrown at runtime. What's also noteworthy is that Clojure is not an object-orientated language (OOP), unlike all the other languages in this book. Clojure still offers interoperability...
