Download e-book for kindle: Clojure for Java Developers by Eduardo Diaz

By Eduardo Diaz

ISBN-10: 178528150X

ISBN-13: 9781785281501

Key Features

  • Write apps for the multithreaded international with Clojure's style of useful programming
  • Discover Clojure's gains and benefits and use them on your latest projects
  • The publication is designed in order that you can be capable placed to take advantage of your latest abilities and software program wisdom to develop into a more beneficial Clojure developer

Book Description

We have reached some degree the place machines aren't getting a lot quicker, software program initiatives must be added fast, and top of the range in software program is extra not easy as ever.

We have to discover new methods of writing software program that is helping in achieving these objectives. Clojure bargains a brand new probability of writing prime quality, multi-core software program speedier than ever, with no need to go away your present platform.

Clojure for Java builders goals at unleashing the real capability of the Clojure language to exploit it on your initiatives. The booklet starts off with the deploy and setup of the Clojure atmosphere prior to relocating directly to discover the language in-depth. Get conversant in its quite a few gains comparable to sensible programming, concurrency, and so forth. with the aid of instance tasks. you will also additionally, learn the way the tooling works, and the way it interacts with the Java environment.

By the tip of this ebook, you have a company grip on Clojure and its beneficial properties, and use them successfully to write down extra powerful programs.

What you'll learn

  • Understand the instruments for the Clojure global and the way they relate to Java instruments and criteria (like Maven)
  • Learn approximately immutable info constructions, and what makes them possible for daily programming
  • Write uncomplicated multi-core courses utilizing Clojure's center options, like atoms, brokers and refs
  • Understand that during Clojure, code is information, and the way to use that truth by way of producing and manipulating code with macros
  • Learn how Clojure interacts with Java, how the category loaders paintings and the way to take advantage of Clojure from Java or the opposite direction around
  • Discover a brand new, extra versatile that means of polymorphism and take into account that OOP isn't the simply technique to get it

About the Author

Eduardo Diaz is a developer with a robust history within the Java language. He has a fondness for practical programming and new programming paradigms. His paintings comprises complete stack improvement, structures layout, and excessive quantity genuine time information processing.

He has labored on each know-how comparable challenge you could think, as a specialist fixing something regarding Java, UNIX, C, or the other unusual challenge you have had.

As a developer, he has been operating for round 10 years on Java, Python, Scala, Clojure, within the media, financial institution, and basically communications industries.

He is at present operating at Grupo enlargement, a media corporation, the place he is helping layout and enforce a brand new content material supply platform aiming to empower content material editors and inspire builders to discover new how you can use data.

Table of Contents

  1. Getting began with Clojure
  2. Namespaces, programs, and Tests
  3. Interacting with Java
  4. Collections and practical Programming
  5. Multimethods and Protocols
  6. Concurrency
  7. Macros in Clojure

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Additional info for Clojure for Java Developers

Sample text

Loving-seq "I love doggies")) (is (lazy-contains? loving-seq "I love chocolate")) (is (lazy-contains? loving-seq "I love you"))))) [ 33 ] Namespaces, Packages, and Tests We can't use the Clojure contents function here because it has a different function. It looks for keys in a map. core-test package. Date class. * to get a similar effect. We can achieve this with the :refer :all keywords. hello with hello and it also makes the <3 function available without a prefix. To generate an alias and make everything available with the hello alias, we use the :as keyword and then pass a vector to :refer to include certain elements.

Png"))))))) It just initializes an image-stream value, it then loads an image from that stream and generates a thumbnail. It finally loads the generated thumbnail and checks that the image width is 50px. Now that we've written our tests and we are sure that everything works, we can use our little library from the Clojure projects, but what happens if we want to use it from a pure Java (or groovy, or scala) project? html. Let's have a look at how we can define a Java class. image. ImageProcessor)) (defn -loadImage [this image-stream] (img/load-image image-stream)) (defn -saveImage [this image path] (img/save-image image path)) (defn -generateThumbnail [this image size] (img/generate-thumbnail image size)) This code is very similar to the Clojure code that we have already seen, except for the gen-class directive and the function names starting with a dash.

The name key defines the name of the class, it is a symbol • The main key defines whether this class should have a main method or not • The method key defines all the methods and their signatures, it is a vector with three parts: [methodName [parameterTypes] returnType] [ 53 ] Interacting with Java The methods are then implemented as functions starting with the (-) character, the prefix can be changed with the prefix key. clj file and add an :aot key with the namespace or namespaces to be compiled in a vector; if you want everything to be compiled in advance, you could use the special :all value.

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Clojure for Java Developers by Eduardo Diaz

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