Download E-books Clojure in Action PDF
By Amit Rathore
Clojure in Action is a hands-on instructional for the operating programmer who has written code in a language like Java or Ruby, yet has no past event with Lisp. It teaches Clojure from the fundamentals to complex subject matters utilizing functional, real-world program examples. Blow during the conception and dive into useful concerns like unit-testing and surroundings set-up, throughout development a scalable web-application utilizing domain-specific languages, Hadoop, HBase, and RabbitMQ.
About the Technology
Clojure is a contemporary Lisp for the JVM, and it has the strengths you'd count on: firstclass services, macros, help for practical programming, and a Lisp-like, fresh programming style.
About this Book
Clojure in Action is a realistic advisor thinking about utilizing Clojure to sensible programming demanding situations. You'll commence with a language educational written for readers who already comprehend OOP. Then, you'll dive into the use instances the place Clojure particularly shines: country administration, secure concurrency and multicore programming, top notch code iteration, and Java interop. In every one bankruptcy, you'll first discover the original features of an issue quarter after which notice the way to take on them utilizing Clojure. alongside the best way, you'll discover sensible concerns like structure, unit checking out, and set-up as you construct a scalable internet program that incorporates customized DSLs, Hadoop, HBase, and RabbitMQ.
buy of the print ebook comes with a suggestion of a loose PDF, ePub, and Kindle book from Manning. additionally on hand is all code from the book.
What's Inside* A fast moving Clojure tutorial
* growing internet prone with Clojure
* Scaling via messaging
* developing DSLs with Clojure's macro system
* Test-driven improvement with Clojure
* dispensed programming with Clojure and more
This booklet assumes you're conversant in an OO language like Java, C#, or C++, yet calls for no heritage in Lisp or Clojure itself.
Table of Contents<ol><h5>PART 1 GETTING STARTED</h5> * advent to Clojure
* A whirlwind tour
* construction blocks of Clojure
* Polymorphism with multimethods
* Clojure and Java interop
* country and the concurrent world
* Evolving Clojure via macros
<h5>PART 2 GETTING genuine </h5> * Test-driven improvement and more
* info garage with Clojure
* Clojure and the web
* Scaling via messaging
* info processing with Clojure
* extra on useful programming
* Protocols, documents, and type
* extra macros and DSLs
Read Online or Download Clojure in Action PDF
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Additional resources for Clojure in Action
The library is open resource and is hosted on github. com. It makes use of a multimethod to parse responses despatched by way of the server because the patron communicates with it. whilst the server sends a reaction, it prefaces the knowledge being requested for with a unmarried personality. those keep watch over characters are proven in desk four. 2. Ragnar has created a multimethod referred to as parse-reply, which procedures the responses from the server. (defmulti parse-reply reply-type :default :unknown) From what we confirmed previous, the default dispatch price has been set to :unknown. desk four. 2 keep watch over characters despatched through the Redis server personality which means – An errors + Single-line answer $ Bulk information * Multi-bulk info : Integer quantity There are six implementations (methods) of this multimethod—one for every of the 5 keep watch over characters and one for the default case. the next directory indicates correct components of the code (only the multimethod component is listed). the alternative of a multimethod right here retains the code within the subsequent directory fresh, effortless to learn, and straightforward to switch. 104 bankruptcy four Polymorphism with multimethods directory four. 1 imposing the Redis protocol utilizing multimethods (defmulti parse-reply reply-type :default :unknown) (defmethod parse-reply :unknown [#^BufferedReader reader] (throw (Exception. (str "Unknown answer type:")))) (defmethod parse-reply \[#^BufferedReader reader] (let [error (read-line-crlf reader)] (throw (Exception. (str "Server mistakes: " error))))) (defmethod parse-reply \+ [#^BufferedReader reader] (read-line-crlf reader)) (defmethod parse-reply \$ [#^BufferedReader reader] (let [line (read-line-crlf reader) size (parse-int line)] (if (< size zero) nil (let [#^chars cbuf (char-array length)] (do (do-read reader cbuf zero size) (read-crlf reader) ;; CRLF (String. cbuf)))))) (defmethod parse-reply \* [#^BufferedReader reader] (let [line (read-line-crlf reader) count number (parse-int line)] (if (< count number zero) nil (loop [i count number replies ] (if (zero? i) replies (recur (dec i) (conj replies (read-reply reader)))))))) (defmethod parse-reply \: [#^BufferedReader reader] (let [line (trim (read-line-crlf reader)) int (parse-int line)] int)) You’ve noticeable the fundamentals of multimethods. We’re now able to movement on; the following bankruptcy exhibits how effortless Clojure makes interoperability with its host language, Java. four. four precis As you’ve visible, what’s often known as polymorphism within the context of languages similar to Java and C++ is a slightly particular type known as subtype polymorphism. additional, the implementation in such languages is proscribed to unmarried dispatch, that is back a selected case of the way more common threat of a number of dispatch. precis one hundred and five those languages join a view of OOP that calls for equipment (and info) belong to the enclosing type. It’s possible that for this reason those languages aid purely unmarried dispatch—they dispatch merely at the receiver simply because it’s the category that owns the possibly polymorphic approach. In Clojure, a multimethod doesn’t belong to whatever. The concrete equipment as a substitute belong to the multimethod, they usually may be dispatched dependent off any variety of kinds.