Clojure for Java Developers by Eduardo Diaz

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By Eduardo Diaz

Key Features

  • Write apps for the multithreaded global with Clojure's style of sensible programming
  • Discover Clojure's positive aspects and benefits and use them on your latest projects
  • The publication is designed in order that you can be capable positioned to take advantage of your present abilities and software program wisdom to develop into a more suitable Clojure developer

Book Description

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

We have to discover new methods of writing software program that is helping in achieving these ambitions. Clojure bargains a brand new probability of writing top of the range, multi-core software program speedier than ever, with no need to depart your present platform.

Clojure for Java builders goals at unleashing the genuine strength of the Clojure language to exploit it on your tasks. The ebook starts off with the set up and setup of the Clojure surroundings ahead of relocating directly to discover the language in-depth. Get conversant in its a number of beneficial properties resembling sensible programming, concurrency, and so forth. with assistance from instance initiatives. you will also additionally, find out how the tooling works, and the way it interacts with the Java environment.

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

What you'll learn

  • Understand the instruments for the Clojure international and the way they relate to Java instruments and criteria (like Maven)
  • Learn approximately immutable facts constructions, and what makes them possible for daily programming
  • Write uncomplicated multi-core courses utilizing Clojure's middle suggestions, like atoms, brokers and refs
  • Understand that during Clojure, code is information, and the way to exploit that truth via producing and manipulating code with macros
  • Learn how Clojure interacts with Java, how the category loaders paintings and the way to exploit Clojure from Java or the wrong way around
  • Discover a brand new, extra versatile that means of polymorphism and keep in mind that OOP isn't the merely solution to get it

About the Author

Eduardo Diaz is a developer with a robust heritage within the Java language. He has a keenness for useful programming and new programming paradigms. His paintings comprises complete stack improvement, platforms layout, and excessive quantity actual time information processing.

He has labored on each expertise comparable challenge you could think, as a expert fixing something concerning Java, UNIX, C, or the other unusual challenge you may have had.

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

He is presently 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, applications, and Tests
  3. Interacting with Java
  4. Collections and useful Programming
  5. Multimethods and Protocols
  6. Concurrency
  7. Macros in Clojure

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Extra info for Clojure for Java Developers

Sample text

First of all, let's review what we already know from Java. Packages in Clojure The Java code is organized in packages, a package in Java is a namespace that allows you to group a set of similar classes and interfaces. You can think of a package as something very similar to a folder in your computer. lang: Everything that's native to Java, including basic types (integer, long, byte, boolean, character, string, number, short, float, void, and class), the basic threading primitives (runnable, thread), the basic primitives for exceptions (throwable, error, exception), the basic exceptions and errors (NoSuchMethodError, OutOfMemoryError, StackOverflowError, and so on) and runtime access classes like runtime and system.

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. core namespace available in the current namespace. We achieve this with the :refer :all keywords. (defn- lazy-contains? [col element] (not (empty? , it is a boolean function and it is customary in Clojure to call it a predicate.

Let's just check if we can generate a thumbnail. Create a new thumbnails. thumbnail-test namespace, in the tests. clj. png") (is (= 600 (get-image-width (io/input-stream "xkcd-width. png"))))))) Here we are using some unknown features, such as the let form and destructuring. We will see this in more detail in the next section. The let statement Clojure gives us a let statement to name things; it allows us to do something very similar to variable declaration in other languages. Keep in mind that we are not actually creating a variable in the same sense, as in Java.

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