Book Image

Clojure High Performance Programming

By : Shantanu Kumar
Book Image

Clojure High Performance Programming

By: Shantanu Kumar

Overview of this book

<p>Clojure is a young, dynamic, functional programming language that runs on the Java Virtual Machine. It is built with performance, pragmatism, and simplicity in mind. Like most general purpose languages, Clojure’s features have different performance characteristics that one should know in order to write high performance code.<br /><br />Clojure High Performance Programming is a practical, to-the-point guide that shows you how to evaluate the performance implications of different Clojure abstractions, learn about their underpinnings, and apply the right approach for optimum performance in real-world programs.<br /><br />This book discusses the Clojure language in the light of performance factors that you can exploit in your own code.</p> <p>You will also learn about hardware and JVM internals that also impact Clojure’s performance. Key features include performance vocabulary, performance analysis, optimization techniques, and how to apply these to your programs. You will also find detailed information on Clojure's concurrency, state-management, and parallelization primitives.</p> <p>This book is your key to writing high performance Clojure code using the right abstraction, in the right place, using the right technique.</p>
Table of Contents (15 chapters)
Clojure High Performance Programming
Credits
About the Author
Acknowledgments
About the Reviewers
www.PacktPub.com
Preface
Index

Persistent data structures


As we've noticed in the previous section, Clojure's data structures are not only immutable, but can also produce new values without impacting the old version. Operations produce these new values in such a way that old values remain accessible; the new version is produced in compliance with the complexity guarantees of that data structure and both the old and new versions continue to meet the complexity guarantees. The operations can be recursively applied to nested data structures and can still meet the complexity guarantees. Such immutable data structures as the ones provided by Clojure are called persistent data structures. They are persistent in that when a new version is created, both the old and new versions persist in terms of both the value and complexity guarantee. They have nothing to do with storage or durability of data. Making changes to the old version doesn't impede working with the new version and vice versa. Both versions persist in a similar way...