By Stuart Halloway
Clojure is a dynamic language for the Java digital laptop, with a compelling blend of features:
Clojure is elegant. Clojure's fresh, cautious layout enables you to write courses that get correct to the essence of an issue, and not using a lot of litter and ceremony.
Clojure is Lisp reloaded. Clojure has the ability inherent in Lisp, yet isn't really restricted through the historical past of Lisp.
Clojure is a functional language. info buildings are immutable, and capabilities are usually side-effect unfastened. This makes it more straightforward to put in writing 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 may get the very same functionality which you could get from hand-written Java code.
Many different languages provide a few of these beneficial properties, however the blend of all of them makes Clojure sparkle. Programming Clojure indicates you why those positive factors are so very important, and the way you should use Clojure to construct robust courses quickly.
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Additional info for Programming Clojure
If you ask Clojure to evaluate the symbol foo, it will return the value of the associated var: foo ⇒ 10 The initial value of a var is called its root binding. 5, Managing Per-Thread State with Vars, on page 192. You can refer to a var directly. The var special form returns a var itself, not the var’s value: (var a-symbol) You can use var to return the var bound to user/foo: ⇒ (var foo) #'user/foo You will almost never see the var form directly in Clojure code. Instead, you will see the equivalent reader macro #’, which also returns the var for a symbol: ⇒ #'foo #'user/foo Why would you want to refer to a var directly?
While 4. jar. After you read the book, you can follow the instructions in the sidebar on the next page to build an up-to-the-minute version of Clojure. Instructions for downloading the sample code are on page 20. Once you have downloaded the sample code, you can test your install by navigating to the directory where you placed the sample code and running a Clojure read-eval-print loop (REPL). The sample code includes REPL launch scripts that load Clojure, plus several other libraries that we will need later in the book.
Elided for brevity ... Because Clojure objects are Java objects, you can also show any Clojure form to see its underlying Java API. PersistentHashSet === [ 0] static EMPTY : PersistentHashSet [ 1] static applyToHelper : Object (IFn,ISeq) [ 2] static create : PersistentHashSet (ISeq) [ 3] static create : PersistentHashSet (List) [ 4] static create : PersistentHashSet (Object) [ 5] add : boolean (Object) [ 6] addAll : boolean (Collection) [ 7] applyTo : Object (ISeq) [ 8] call : Object () ... elided for brevity ...
Programming Clojure by Stuart Halloway