Chas Emerick - Clojure Programming
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- Book:Clojure Programming
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Clojure is a practical, general-purpose language that offers expressivity rivaling other dynamic languages like Ruby and Python, while seamlessly taking advantage of Java libraries, services, and all of the resources of the JVM ecosystem. This book helps you learn the fundamentals of Clojure with examples relating it to the languages you know already, in the domains and topics you work with every day. See how this JVM language can help eliminate unnecessary complexity from your programming practice and open up new options for solving the most challenging problems.
Clojure Programming demonstrates the languages flexibility by showing how it can be used for common tasks like web programming and working with databases, up through more demanding applications that require safe, effective concurrency and parallelism, data analysis, and more. This in-depth look helps tie together the full Clojure development experience, from how to organize your project and an introduction to Clojure build tooling, to a tutorial on how to make the most of Clojures REPL during development, and how to deploy your finished application in a cloud environment.
- Learn how to use Clojure while leveraging your investment in the Java platform
- Understand the advantages of Clojure as an efficient Lisp for the JVM
- See how Clojure is used today in several practical domains
- Discover how Clojure eliminates the need for many verbose and complicated design patterns
- Deploy large or small web applications to the cloud with Clojure
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Copyright 2012 Chas Emerick, Brian Carper and Christophe Grand, Chas Emerick and Dave Fayram
OReilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (.
Nutshell Handbook, the Nutshell Handbook logo, and the OReilly logo are registered trademarks of OReilly Media, Inc. Clojure Programming , the image of a painted snipe, and related trade dress are trademarks of OReilly Media, Inc.
Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this book, and OReilly Media, Inc., was aware of a trademark claim, the designations have been printed in caps or initial caps.
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.
Clojure is a dynamically and strongly typed programming language hosted on the Java Virtual Machine (JVM), now in its fifth year. It has seen enthusiastic adoption by programmers from a variety of backgrounds, working in essentially all problem domains. Clojure offers a compelling mix of features and characteristics applicable to solving modern programming challenges:
Functional programming foundations, including a suite of persistent data structures with performance characteristics approaching typical mutable data structures
A mature, efficient runtime environment, as provided by the host JVM
JVM/Java interoperability capabilities suited for a wide variety of architectural and operational requirements
A set of mechanisms providing reliable concurrency and parallelism semantics
A Lisp pedigree, thereby providing remarkably flexible and powerful metaprogramming facilities
Clojure offers a compelling practical alternative to many who strain against the limitations of typical programming languages and environments. We aim to demonstrate this by showing Clojure seamlessly interoperating with existing technologies, libraries, and services that many working programmers already use on a day-to-day basis. Throughout, well provide a solid grounding in Clojure fundamentals, starting from places of common expertise and familiarity rather than from (often foreign) computer science first principles.
We wrote this book with a couple of audiences in mind. Hopefully, you consider yourself a part of one of them.
Clojure matches and often exceeds your current favorite languages expressivity, concision, and flexibility while allowing you to effortlessly leverage the performance, libraries, community, and operational stability of the JVM. This makes it a natural next step for Java developers (and even JVM developers using interpreted or otherwise not particularly fast non-Java languages), who simply will not accept a performance hit or who do not want to give up their JVM platform investment. Clojure is also a natural step for Ruby and Python developers who refuse to compromise on language expressivity, but wish they had a more reliable, efficient execution platform and a larger selection of quality libraries.
There are millions of Java developers in the world, but some fewer number are working in demanding environments solving nontrivial, often domain-specific problems. If this describes you, youre probably always on the hunt for better tools, techniques, and practices that will boost your productivity and value to your team, organization, and community. In addition, youre probably at least somewhat frustrated with the constraints of Java compared to other languages, but you continue to find the JVM ecosystem compelling: its process maturity, massive third-party library selection, vendor support, and large skilled workforce is hard to walk away from, no matter how shiny and appealing alternative languages are.
Youll find Clojure to be a welcome relief. It runs on the JVM with excellent performance characteristics, interoperates with all of your existing libraries, tools, and applications, and is simpler than Java, yet is demonstrably more expressive and less verbose.
Ruby and Python are not new languages by any means, but they have garnered significant (dare we say, mainstream?) traction over recent years. Its not hard to see why: both are expressive, dynamic languages that, along with their thriving communities, encourage maximal developer productivity in many domains.
Clojure is a natural next step for you. As a Ruby or Python programmer, youre probably unwilling to compromise on their strengths, but you may wish for a more capable execution platform, better runtime performance, and a larger selection of libraries. The fact that Clojure is efficiently hosted on the JVM fulfills those desiresand it matches or exceeds the degrees of language sophistication and developer productivity that youve come to expect.
We will frequently compare and contrast Clojure with Java, Ruby, and Python to help you translate your existing expertise to Clojure. In such comparisons, we will always refer to the canonical implementations of these other languages:
Ruby MRI (also called CRuby)
CPython
Java 6/7
In formulating our approach to this book, we wanted to provide a fair bit of concrete detail and practical examples that you could relate to, but stay clear of what we thought were generally unsuccessful approaches for doing so. In particular, weve been frustrated in the past by books that attempted to thread the implementation of a single program or application through their pages. Such approaches seem to result in a disjointed narrative, as well as the dominance of a tortured practical example that may or may not apply or appeal to readers.
With that in mind, we split the book in two, starting with foundational, instructional narrative that occupies roughly two-thirds of the book, followed in .) In any case, we can conceive of two obvious approaches to reading it.
Often the best way to learn is to dig straight into the nitty-gritty of how a language is used in the real world. If that sounds appealing, the hope is that you will find that at least a couple of the practicums resonate with what you do on a day-to-day basis, so that you can readily draw parallels between how you solve certain categories of problems in your current language(s) and how they may be solved using Clojure. Youre going to bump into a lot of potentially foreign concepts and language constructs in those chapterswhen you do, use that context within the domain in question as your entry point for understanding those concepts using the relevant instructional material in the first part of the book.
Sometimes the only way to truly understand something is to learn it inside-out, starting with the fundamentals. If you prefer that approach, then you will likely find that digesting this book starting from the first page of will be best. We have attempted to provide a comprehensive treatment of all of Clojures foundational principles and constructs in a narrative that progresses such that it will be
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