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Wampler - Functional Programming for Java Developers

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Software development today is embracing functional programming (FP), whether its to write concurrent programs or to manage Big Data. Where does that leave Java developers? This concise book offers a pragmatic, approachable introduction to FP for Java developers or anyone who uses an object-oriented language. Using exercises in each chapter, youll learn how to apply FP principles to your Java code.

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Functional Programming for Java Developers
Dean Wampler
Editor
Mike Loukides
Editor
Shawn Wallace

Copyright 2011 Dean Wampler

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While every precaution has been taken in the preparation of this book, the publisher and authors assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein.

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A Note Regarding Supplemental Files

Supplemental files and examples for this book can be found at http://examples.oreilly.com/0636920021667/. Please use a standard desktop web browser to access these files, as they may not be accessible from all ereader devices.

All code files or examples referenced in the book will be available online. For physical books that ship with an accompanying disc, whenever possible, weve posted all CD/DVD content. Note that while we provide as much of the media content as we are able via free download, we are sometimes limited by licensing restrictions. Please direct any questions or concerns to .

Preface
Welcome to Functional Programming for Java Developers

Why should a Java developer learn about functional programming (FP)? After all, hasnt functional programming been safely hidden in academia for decades? Isnt object- oriented programming (OOP) all we really need? This book explains why functional programming has become an important tool for the challenges of our time and how you, a Java developer, can use it to your advantage.

) is difficult to do well and few developers are good at it. As well see, functional programming offers better strategies for writing robust, concurrent software.

An example of the greater need for horizontal scalability is the growth of massive data sets requiring management and analysis, the so-called big data trend. These are data sets that are too large for traditional database management systems. They require clusters of computers to store and process the data. Today, its not just Google, Yahoo!, Facebook, and Twitter who work with big data. Many organizations face this challenge.

(OReilly). Scala is a JVM language, a potential successor to Java, with the goal of bringing object-oriented and functional programming into one coherent whole. Clojure is the other well-known functional language on the JVM. It is a Lisp dialect that minimizes the use of OOP in favor of functional programming. Clojure embodies a powerful vision for how programming should be done.

Fortunately, you dont have to adopt a new language to enjoy many of the benefits of functional programming. Back in early 1990s, I used an object-oriented approach in the C software I wrote, until I could use C++. Similarly, if youre working with an object-oriented language, like Java, you can still apply many of the ideas from functional programming.

Unfortunately, much of the literature on functional programming is difficult to understand for people who are new to it. This short book offers a pragmatic, approachable introduction to functional programming. While aimed at the Java developer, the principles are general and will benefit anyone familiar with an object-oriented language.

I assume that you are well versed in object-oriented programming and you can read Java code. Youll find some exercises at the end of each chapter to help you practice and expand on what youve learned.

Because this is a short introduction and because it is difficult to represent some functional concepts in Java, there will be several topics that I wont discuss in the text, although I have added glossary entries, for completeness. These topics include currying , partial application , and comprehensions . Ill briefly discuss several other topics, such as combinators , laziness , and monads , to give you a taste of their importance. However, fully understanding these topics isnt necessary when youre new to functional programming.

I hope you find functional programming as seductive as I did. Let me know how it goes!

You can learn more at the books catalog page (http://oreilly.com/catalog/9781449311032/).

Conventions Used in This Book

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Using the Code Examples

This book is here to help you get your job done. In general, you may use the code in this book in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.

We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: Functional Programming for Java Developers , by Dean Wampler (OReilly). Copyright 2011 Dean Wampler, 978-1-449-31103-2.

.

Some of the code examples were adapted from examples provided with the Akka distribution, copyright 2009-2011 Scalable Solutions AB. The Akka code base is covered by the Apache 2 License.

Getting the Code Examples

You can download the code examples from http://examples.oreilly.com/9781449311032/. Unzip the files to a convenient location. See the README file in the distribution for instructions on building and using the examples.

Note that some of the files wont actually compile, because they introduce speculative concepts that arent supported by current compilers or libraries. Those files end with the extension

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