By Stuart Halloway
Clojure is a dynamic language for the Java digital desktop, with a compelling mix of features:
Clojure is elegant. Clojure's fresh, cautious layout enables you to write courses that get correct to the essence of an issue, with out a lot of muddle and ceremony.
Clojure is Lisp reloaded. Clojure has the facility inherent in Lisp, yet isn't limited by way of the background of Lisp.
Clojure is a functional language. facts buildings are immutable, and services are usually side-effect loose. This makes it more straightforward to write down right courses, and to compose huge courses from smaller ones.
Clojure is concurrent. instead of error-prone locking, Clojure offers software program transactional memory.
Clojure embraces Java. Calling from Clojure to Java is direct, and is going via no translation layer.
Clojure is fast. anyplace you would like it, you will get the very same functionality which you can get from hand-written Java code.
Many different languages supply a few of these gains, however the blend of all of them makes Clojure sparkle. Programming Clojure exhibits you why those gains are so vital, and the way you should use Clojure to construct robust courses quickly.
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Extra resources for Programming Clojure
Thread is the class name of the instance, and Thread[Thread-0,5,main] is the instance’s toString representation. (Note that in the preceding example the new thread will run to completion, but its output may interleave in some strange way with the REPL prompt. ) Because the Java invocation syntax in Clojure is clean and simple, it is idiomatic to use Java directly, rather than to hide Java behind Lispy wrappers. Now that you have seen a few of the reasons to use Clojure, it is time to start writing some code.
1 more Java interop is covered in Chapter 3, Working with Java, on page 79. If you have a block of code that is too large to conveniently type at the REPL, save the code into a file, and then load that file from the REPL. clj, and then ... clj") The REPL is a terrific environment for trying ideas and getting immediate feedback. For best results, keep a REPL open at all times while reading this book. Adding Shared State The hello function of the previous section is pure; that is, it has no side effects.
The quote character (’) prevents evaluation: ⇒ '(1 2) (1 2) ’(1 2) is equivalent to the longer (quote (1 2)): ⇒ (quote (1 2)) (1 2) The other reader macros are covered later in the book. In the following table, you’ll find a quick syntax overview and references to where each reader macro is covered. 3, Making Macros Simpler, on page 218 Chapter 6, Concurrency, on page 177 Clojure does not allow programs to define new reader macros. 5 If you come from a Lisp background, this may be frustrating. I feel your pain.