Clojure编程：探索JVM平台的语言性能与灵活性

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"Clojure Programming" 是一本由 Chas Emerick、Brian Carper 和 Christophe Grand 合著的书籍，旨在介绍和深入探讨Clojure编程语言。这本书主要面向那些熟悉Java、Ruby或Python等语言，并希望进一步提升语言表达性、效率和灵活性的开发者。Clojure作为基于JVM的语言，它在保持高性能的同时提供了丰富的表达性和简洁性，因此对于Java开发者来说是一个自然的过渡选择。而对于Ruby和Python开发者，Clojure则提供了更可靠的执行平台和更多优质库的选择。书中的内容可能涵盖以下几个方面： 1. **Clojure基础知识**：书中可能会详细介绍Clojure的基本语法、数据结构（如向量、列表、映射和集合）以及其独特的引用类型，如atom、ref和agent，这些都是Clojure并发编程的关键。 2. **函数式编程**：Clojure是函数式编程语言，书中可能会讨论函数式编程的核心概念，如纯函数、高阶函数、闭包以及函数组合，这些都使得Clojure代码更具可读性和可维护性。 3. **JVM集成**：Clojure充分利用JVM的优势，书中会讲解如何与Java代码互操作，调用Java库，并利用JVM的性能和稳定性。 4. **并行和并发**：Clojure设计了强大的工具来处理并行和并发问题，如软件事务内存（STM）系统，书中会详细阐述这些机制以及如何编写高效的并发程序。 5. **宏和元编程**：Clojure的宏系统允许在编译时进行代码操作，这使得元编程变得非常强大，书会解释如何编写和使用宏来扩展语言功能。 6. **Clojure生态系统**：书中可能涵盖了Clojure社区的主要库和工具，如Leiningen（项目管理工具）、Ring（Web开发框架）和ClojureScript（Clojure到JavaScript的编译器），以及如何利用它们来构建实际项目。 7. **最佳实践和案例研究**：作者可能会分享一些最佳实践和真实世界的例子，帮助读者理解如何在实际项目中有效地应用Clojure。 8. **错误处理和调试**：书中的内容可能包括Clojure中的异常处理机制、调试技巧以及如何优化代码性能。 9. **持续学习和资源**：书中可能会提供进一步学习Clojure的资源，包括社区论坛、文档和在线教程。 "Clojure Programming" 是一本全面的指南，旨在帮助开发者理解和掌握Clojure语言，不论他们来自何种编程背景，都能从中受益，提升他们的编程技能和效率。

Who’s “We”?

We are three software developers who have each taken different paths in coming to use

and appreciate Clojure. In writing this book, we have attempted to distill all that we’ve

learned about why and how you should use Clojure so that you can be successful in

your use of it as well.

Chas Emerick

Chas has been a consistent presence in the Clojure community since early 2008. He

has made contributions to the core language, been involved in dozens of Clojure open

source projects, and frequently writes and speaks about Clojure and software devel-

opment generally.

Chas maintains the Clojure Atlas (http://clojureatlas.com), an interactive visualization

of and learning aid for the Clojure language and its standard libraries.

The founder of Snowtide (http://snowtide.com), a small software company in Western

Massachusetts, Chas’s primary domain is unstructured data extraction, with a partic-

ular specialty around PDF documents. He writes about Clojure, software development,

entrepreneurship, and other passions at http://cemerick.com.

Brian Carper

Brian is a Ruby programmer turned Clojure devotee. He’s been programming Clojure

since 2008, using it at home and at work for everything from web development to data

analysis to GUI apps.

Brian is the author of Gaka (https://github.com/briancarper/gaka), a Clojure-to-CSS

compiler, and Oyako (https://github.com/briancarper/oyako), an Object-Relational

Mapping library. He writes about Clojure and other topics at http://briancarper.net.

Christophe Grand

Christophe was a long-time enthusiast of functional programming lost in Java-land

when he encountered Clojure in early 2008, and it was love at first sight! He authored

Enlive (http://github.com/cgrand/enlive), an HTML/XML transformation, extraction,

and templating library; Parsley (http://github.com/cgrand/parsley), an incremental

parser generator; and Moustache (http://github.com/cgrand/moustache), a routing and

middleware application DSL for Ring.

As an independent consultant, he develops, coaches, and offers training in Clojure. He

also writes about Clojure at http://clj-me.cgrand.net.

xiv | Preface

Acknowledgments

Like any sizable piece of work, this book would not exist without the tireless efforts of

dozens, probably hundreds of people.

First, Rich Hickey, the creator of Clojure. In just a few short years, he has designed,

implemented, and shepherded a new programming language into the world that, for

so many, has been not just another tool, but a reinvigoration of our love of program-

ming. Beyond that, he’s personally taught us a great deal—certainly about program-

ming, but also about patience, humility, and perspective. Thanks, Rich.

Dave Fayram and Mike Loukides were essential in helping to formulate the initial con-

cept and approach of the book. Of course, you likely wouldn’t be reading this book

right now if it weren’t for Julie Steele, our editor, and all of the fine people at O’Reilly

who took care of the logistics and minutiae that go along with publishing.

The quality of this book would be far less than it is were it not for the efforts of our

technical reviewers, including Sam Aaron, Antoni Batchelli, Tom Faulhaber, Chris

Granger, Anthony Grimes, Phil Hagelberg, Tom Hicks, Alex Miller, William Morgan,

Laurent Petit, and Dean Wampler. We’d also like to thank all of those who provided

feedback and comments on the early releases and Rough Cuts of the book, both on the

O’Reilly forums and via email, Twitter, and so on.

Michael Fogus and Chris Houser have inspired us in many ways large and small. One

of the smaller ways was the style and presentation of the REPL interactions in their

Clojure book, The Joy of Clojure, which we shamelessly copied and iterated.

If we’ve neglected to mention anyone, please accept our implicit thanks and our apol-

ogies; at the end of this endeavor, we are quite lucky to be upright and coherent at all!

And Last, but Certainly Far from Least

The Clojure community has been my home away from home for a number of years.

The hospitality and positive, helpful energy I see anywhere Clojure programmers con-

gregate continues to be an inspiration and example to me. In particular, many of the

regular denizens of #clojure on Freenode IRC—in addition to becoming good

friends—have guided me toward learning things I never would have otherwise.

To my coauthors, Christophe and Brian: working with you has been a great honor for

me. There is absolutely no way that I would have been able to complete this work

without you.

To my parents, Charley and Darleen: my compulsive curiosity about how things work,

my love of language and rhetoric, and my interest in business—all of these can be traced

back over the years to your consistent influence. Without it, I am certain I would not

have found my unique path, started a software company, or written this book, each

done against all odds.

Preface | xv

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