Damian Conway

Perl Best Practices

Standards and Styles for Developing Maintainable Code

• Broschiertes Buch

Produktbeschreibung

Many programmers code by instinct, relying on convenient habits or a "style" they picked up early on. They aren't conscious of all the choices they make, like how they format their source, the names they use for variables, or the kinds of loops they use. They're focused entirely on problems they're solving, solutions they're creating, and algorithms they're implementing. So they write code in the way that seems natural, that happens intuitively, and that feels good. But if you're serious about your profession, intuition isn't enough. Perl Best Practices author Damian Conway explains that rules, conventions, standards, and practices not only help programmers communicate and coordinate with one another, they also provide a reliable framework for thinking about problems, and a common language for expressing solutions. This is especially critical in Perl, because the language is designed to offer many ways to accomplish the same task, and consequently it supports many incompatible dialects. With a good dose of Aussie humor, Dr. Conway (familiar to many in the Perl community) offers 256 guidelines on the art of coding to help you write better Perl code--in fact, the best Perl code you possibly can. The guidelines cover code layout, naming conventions, choice of data and control structures, program decomposition, interface design and implementation, modularity, object orientation, error handling, testing, and debugging. They're designed to work together to produce code that is clear, robust, efficient, maintainable, and concise, but Dr. Conway doesn't pretend that this is the one true universal and unequivocal set of best practices. Instead, Perl Best Practices offers coherent and widely applicable suggestions based on real-world experience of how code is actually written, rather than on someone's ivory-tower theories on howsoftware ought to be created. Most of all, Perl Best Practices offers guidelines that actually work, and that many developers around the world are already using. Much like Perl itself, these guidelines are about helping you to get your job done, without getting in the way. Praise for Perl Best Practices from Perl community members: "As a manager of a large Perl project, I'd ensure that every member of my team has a copy of Perl Best Practices on their desk, and use it as the basis for an in-house style guide."-- Randal Schwartz "There are no more excuses for writing bad Perl programs. All levels of Perl programmer will be more productive after reading this book."-- Peter Scott "Perl Best Practices will be the next big important book in the evolution of Perl. The ideas and practices Damian lays down will help bring Perl out from under the embarrassing heading of "scripting languages". Many of us have known Perl is a real programming language, worthy of all the tasks normally delegated to Java and C++. With Perl Best Practices, Damian shows specifically how and why, so everyone else can see, too."-- Andy Lester "Damian's done what many thought impossible: show how to build large, maintainable Perl applications, while still letting Perl be the powerful, expressive language that programmers have loved for years."-- Bill Odom "Finally, a means to bring lasting order to the process and product of real Perl development teams."-- Andrew Sundstrom"Perl Best Practices provides a valuable education in how to write robust, maintainable Perl, and is a definitive citation source when coaching other programmers."-- Bennett Todd"I've been teaching Perl for years, and find the same question keeps being asked: Where can I find a reference for writing reusable, maintainable Perl code? Finally I have a decent answer."-- Paul Fenwick"At last a well researched, well thought-out, comprehensive guide to Perl style. Instead of each of us developing our own, we can learn good practices from one of Perl's most prolific and experienced authors. I recommend this book to anyone who prefers getting on with the job

Produktdetails

• Verlag: O'Reilly Media
• Seitenzahl: 542
• Erscheinungstermin: 16. August 2005
• Englisch
• Abmessung: 237mm x 182mm x 35mm
• Gewicht: 815g
• ISBN-13: 9780596001735
• ISBN-10: 0596001738
• Artikelnr.: 14122824

Autorenporträt

Damian Conway holds a PhD in Computer Science and is an honorary Associate Professor with the School of Computer Science and Software Engineering at Monash University, Melbourne, Australia.Currently he runs an international IT training company--Thoughtstream--which provides programmer development from beginner to masterclass level throughout Europe, North America, and Australasia.Damian was the winner of the 1998, 1999, and 2000 Larry Wall Awards for Practical Utility. The best technical paper at the annual Perl Conference was subsequently named in his honour. He is a member of the technical committee for The Perl Conference, a keynote speaker at many Open Source conferences, a former columnist for The Perl Journal, and author of the book Object Oriented Perl. In 2001 Damian received the first "Perl Foundation Development Grant" and spent 20 months working on projects for the betterment of Perl.A popular speaker and trainer, he is also the author of numerous well-known Perl modules, including Parse::RecDescent (a sophisticated parsing tool), Class::Contract (design-by-contract programming in Perl), Lingua::EN::Inflect (rule-based English transformations for text generation), Class::Multimethods (multiple dispatch polymorphism), Text::Autoformat (intelligent automatic reformatting of plaintext), Switch (Perl's missing case statement), NEXT (resumptive method dispatch), Filter::Simple (Perl-based source code manipulation), Quantum::Superpositions (auto-parallelization of serial code using a quantum mechanical metaphor), and Lingua::Romana::Perligata (programming in Latin).Most of his time is now spent working with Larry Wall on the design of the new Perl 6 programming language.

Inhaltsangabe

Dedication
Preface
Chapter 1: Best Practices
Chapter 2: Code Layout
Chapter 3: Naming Conventions
Chapter 4: Values and Expressions
Chapter 5: Variables
Chapter 6: Control Structures
Chapter 7: Documentation
Chapter 8: Built-in Functions
Chapter 9: Subroutines
Chapter 10: I/O
Chapter 11: References
Chapter 12: Regular Expressions
Chapter 13: Error Handling
Chapter 14: Command-Line Processing
Chapter 15: Objects
Chapter 16: Class Hierarchies
Chapter 17: Modules
Chapter 18: Testing and Debugging
Chapter 19: Miscellanea
Essential Perl Best Practices
Perl Best Practices
Editor Configurations
Recommended Modules and Utilities
Bibliography
Colophon

Rezensionen

"Kaum eine Sprache macht es einem dermaßen leicht, unleserlichen und unwartbaren Code zu produzieren. [...] Dieses Buch hat es sich zur Aufgabe gemacht, letzteres zu verhindern. Es beschreibt Konventionen, die sich auch mit vertretbarem Aufwand in der Praxis umsetzen lassen.

Natürlich hat jeder Entwickler auch selbst schonmal über Einrückungen, Klammersetzung, Namenskonventionen und Kommentare nachgedacht. Um ein Team diesbezüglich 'auf den gleichen Nenner zu bringen' benötigt man aber einen Style-Guide. Und genau das leistet Perl Best Practices.

Dabei werden neben den oben genannten formalen auch mehr technische Themen behandelt, wie die Behandlung von Fehlern, das Parsen von Kommandozeilenparametern oder die Anlage von Klassen und Modulen.

Fazit: Ich bin der Ansicht, daß sich jeder Perl-Entwickler dieses Buch einmal genau angesehen haben sollte. Idealerweise findet es seinen Weg auf den Schreibtisch jedes Entwicklers." - Hitforum.de, Februar 2006

"Das Buch ist verständlich und humorvoll geschrieben, und lässt sich auch von vorne bis hinten lesen, ohne das man dabei am Rechner sitzen muß. Aber es ist auch kein Buch, das nachdem man es gelesen hat im Regal verstaubt: Ich habe es zum programmieren jedenfalls immer wieder heraus geholt. Die Ratschläge fand ich insgesamt sehr nützlich. Sehr oft findet man Konstrukte wieder, die man so oder in ähnlicher Form schon benutzt oder in fremdem Code gesehen hat, ohne sich über die Nebenwirkungen im Klaren zu sein. Besonders in den hinteren Kapiteln des Buches in denen es um komplexere Themen geht, helfen die Empfehlungen von sinnvollen CPAN- Modulen, das Rad nicht neu zu erfinden, falls man in der Vielfalt der verfügbaren Module im CPAN mal das Richtige übersehen hat. Besonders gefallen haben mir die vielen gut ausgesuchten Codebeispiele. Die einzelnen Ratschläge sind in sich konsistent und gut begründet.

Das Buch ist aber mehr als eine Sammlung von Tipps oder HOWTOS: Damian Conway weicht hier vom Perl-Mantra "There's More Than One Way To Do It" ab und präsentiert mit seinen Best Practices einen Programmierstil, der bewusst auf einige Möglichkeiten von Perl verzichtet um dem Ziel der besseren Lesbarkeit und geringeren Fehleranfälligkeit gerecht zu werden, meiner Meinung nach mit Erfolg. [...]

Wer schon etwas Programmiererfahrung mit Perl hat und sich an größere Projekte wagen will sollte sich das Buch anschauen, bevor er sich zu viele schlechte Angewohnheiten aneignet." - Leserrezension der Linux Studentensiedlung Freiburg, November 2005

Lesen Sie die ausführliche Besprechung unter: http://linux.studentensiedlung.de/books/perl_bp.php"The book Perl Best Practices gives a huge number of useful hints how to improve Perl code and how to make it more robust. Especially the overviews of the best practices in Appendix A and B give a rapid understanding of the most important issues." - Prof. Dr. Axel Hein, Georg-Simon-Ohm-Fachhochschule Nürnberg, Februar 2006