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  • Book Overview & Buying Clojure for Java Developers
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Clojure for Java Developers

Clojure for Java Developers

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Clojure for Java Developers

Clojure for Java Developers

Overview of this book

We have reached a point where machines are not getting much faster, software projects need to be delivered quickly, and high quality in software is more demanding as ever. We need to explore new ways of writing software that helps achieve those goals. Clojure offers a new possibility of writing high quality, multi-core software faster than ever, without having to leave your current platform. Clojure for Java developers aims at unleashing the true potential of the Clojure language to use it in your projects. The book begins with the installation and setup of the Clojure environment before moving on to explore the language in-depth. Get acquainted with its various features such as functional programming, concurrency, etc. with the help of example projects. Additionally, you will also, learn how the tooling works, and how it interacts with the Java environment. By the end of this book, you will have a firm grip on Clojure and its features, and use them effectively to write more robust programs.
Table of Contents (9 chapters)
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8
Index

Debugging your first macro


Now, as you can imagine, since things can get complicated when using macros, there should be some way to debug them. We have two functions to accomplish that:

  • macroexpand

  • macroexpand-1

The difference between them has to do with recursive macros. There is no rule telling you that you can't use a macro from a macro (the whole language is there all the time, remember?). If you wish to go all the way through any macro, you can use macroexpand; if you wish to go a single step forward, you can use macroexpand-1.

Both of them show you the code generated by a macro call; this is what happens when you compile your Clojure code.

Give this a try:

(macroexpand-1
'(my-if (> a 200)
    (do
      (println"Bigger than 200")
      :bigger)
    (do
      (println"Smaller than 200")
      :smaller)))

;; (if (> a 200) (do (println"Bigger than 200") :bigger) (do (println"Smaller than 200") :smaller))

There is not much more to macros than this; you now understand them to a good...

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