《编程Erlang第2版：实战与项目精华》2013

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"《Pragmatic Programming with Erlang 第二版 (2013)》是一本深入浅出的IT专业书籍，由Joe Armstrong所著，是编程领域的重要参考资料。此书不仅涵盖了Erlang语言的核心内容和框架基础，还特别关注了当时的社区关键项目，如rebar和cowboy。对于初学者来说，这本书提供了清晰且结构化的学习路径，帮助他们逐步掌握关键语言概念。作者以其丰富经验和深入洞察，为读者带来了实用的编程技巧和新视角。书中的内容不仅限于Erlang开发者，而是面向所有希望理解Actor模型及其在构建反应式、可扩展、容错应用中重要性的程序员。书中所介绍的Actor模型是一种函数式编程范式，特别适合处理并发和分布式计算。评论家如前AOL CTO Alexander Gounares称赞此书为一种实用且理智的函数编程入门指南，而Gilad Bracha，Java语言和虚拟机规范的合著者，以及Newspeak语言的创造者，以及Dart语言团队成员，也高度评价了这本书，认为它有助于理解Actor模型的精髓，并将其视为在现代软件开发中不可或缺的工具。《Pragmatic Programming with Erlang 第二版》是一本全面且具有实践价值的书籍，无论你是Erlang新手还是资深开发者，都能从中受益匪浅。通过阅读本书，读者将能够提升编程技能，尤其是在处理高并发和分布式系统方面，为构建高效、可靠的软件打下坚实的基础。"

source contributions. We’ll talk about programming idioms and how to

program multicore CPUs. And finally, Sherlock Holmes will analyze our

thoughts.

At the end of each chapter, you’ll find a selection of programming exercises.

These are to test your knowledge of the chapter and to challenge you. The

problems vary from easy to difficult. The most difficult problems would be

suitable research projects. Even if you don’t try to solve all the problems, just

thinking about the problems and how you would solve them will enhance

your understanding of the text.

The Code in This Book

Most of the code snippets come from full-length, running examples that you

can download.

To help you find your way, if a code listing in this book can

be found in the download, there’ll be a bar above the snippet (just like the

one here):

shop1.erl

-module(shop1).

-export([total/1]).

total([{What, N}|T]) -> shop:cost(What) * N + total(T);

total([]) -> 0.

This bar contains the path to the code within the download. If you’re reading

the ebook version of this book and your ebook reader supports hyperlinks,

you can click the bar, and the code should appear in a browser window.

Help! It Doesn’t Work

Learning new stuff is difficult. You will get stuck. When you get stuck, rule

1 is to not silently give up. Rule 2 is to get help. Rule 3 is to ask Sherlock.

Rule 1 is important. There are people who have tried Erlang, gotten stuck

and given up, and not told anybody. If we don’t know about a problem, we

can’t fix it. End of story.

The best way to get help is to first try Google; if Google can’t help, send mail

to the Erlang mailing list.

You can also try

#erlounge

#erlang

irc.freenode.net

for a faster response.

Sometimes the answer to your question might be in an old posting to the

Erlang mailing list but you just can’t find it. In Chapter 27, Sherlock's Last

http://www.pragprog.com/titles/jaerlang2/source_code

erlang-questions@erlang.org

Introduction • xvi

report erratum • discuss

Download from Wow! eBook <www.wowebook.com>

Case, on page 457, there’s a program you can run locally that can perform

sophisticated searches on all the old postings to the Erlang mailing list.

So, without further ado, I’ll thank the good folks who helped me write this

book (and the first edition), and you can skip on to Chapter 1, where we’ll

take a lightning tour of Erlang.

Acknowledgments

First Edition

Many people helped in the preparation of this book, and I’d like to thank them

all here.

First, Dave Thomas, my editor: Dave taught me to write and subjected me to

a barrage of never-ending questions. Why this? Why that? When I started the

book, Dave said my writing style was like “standing on a rock preaching.” He

said, “I want you to talk to people, not preach.” The book is better for it.

Thanks, Dave.

Next, I had a little committee of language experts at my back. They helped

me decide what to leave out. They also helped me clarify some of the bits that

are difficult to explain. Thanks here (in no particular order) to Björn Gustavs-

son, Robert Virding, Kostis Sagonas, Kenneth Lundin, Richard Carlsson, and

Ulf Wiger.

Thanks also to Claes Vikström who provided valuable advice on Mnesia, to

Rickard Green who gave information on SMP Erlang, and to Hans Nilsson for

the stemming algorithm used in the text-indexing program.

Sean Hinde and Ulf Wiger helped me understand how to use various OTP

internals, and Serge Aleynikov explained active sockets to me so that I could

understand.

Helen Taylor (my wife) proofread several chapters and provided hundreds of

cups of tea at appropriate moments. What’s more, she put up with my rather

obsessive behavior for seven months. Thanks also to Thomas and Claire; and

thanks to Bach and Handel, my cats Zorro and Daisy, and my Sat Nav Doris,

who helped me stay sane, purred when stroked, and got me to the right

addresses.

Finally, to all the readers of the beta book who filled in errata requests: I have

cursed you and praised you. When the first beta went out, I was unprepared

for the entire book to be read in two days and for you to shred every page

with your comments. But the process has resulted in a much better book

report erratum • discuss

Acknowledgments • xvii

Download from Wow! eBook <www.wowebook.com>

than I had imagined. When (as happened several times) dozens of people said,

“I don’t understand this page,” then I was forced to think again and rewrite

the material concerned. Thanks for your help, everybody.

Second Edition

First, my new editor, Susannah Pfalzer, helped a lot in suggesting new ways

to reorganize and refocus the book. It was great working with you; you’ve

taught me a lot.

Kenneth Lundin and the guys in the OTP group worked hard to deliver the

new language features described in the second edition.

Many readers of the first edition provided feedback on things they didn’t

understand, so I hope these are now rectified.

The design of maps is inspired by the work of Richard A. O’Keefe (who called

them frames). Richard has championed the cause of frames on the Erlang

mailing list for many years. Thanks, Richard, for all your comments and

suggestions.

Kostis Sagonas provided lots of helpful feedback on the treatment of the type

system.

I’d also like to thank Loïc Hoguin for his permission to use some examples

from the cowboy web server from Nine Nines and the guys from Basho who

wrote the code for BitLocker. I’d also like to thank Dave Smith for his work

with rebar.

A number of people helped me by reviewing various drafts of the second edi-

tion. I’d like to thank all of them; they made this a better book. So, thanks

to Erik Abefelt, Paul Butcher, Mark Chu-Carroll, Ian Dees, Henning Diedrich,

Jeremy Frens, Loïc Hoguin, Andy Hunt, Kurt Landrus, Kenneth Lundin, Evan

Miller, Patrik Nyblom, Tim Ottinger, Kim Shrier, and Bruce Tate for your help.

Helen Taylor (Twitter

@mrsjoeerl

) made countless cups of tea and cheered me

up when I thought the book would never get finished.

Gustav Mahler, Sergei Rachmaninoff, Richard Wagner, and George Frideric

Handel composed music (and Bob Dylan and few other guys…) that I played

in the background while writing much of this book.

Introduction • xviii

report erratum • discuss

Download from Wow! eBook <www.wowebook.com>

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