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Perl Medic: Transforming Legacy Code, by Peter Scott
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Bring new power, performance, and scalability to your existing Perl code!
- Cure whatever ails your Perl code!
- Maintain, optimize, and scale any Perl software... whether you wrote it or not
- Perl software engineering best practices for enterprise environments
- Includes case studies and code in a fun-to-read format
- Scale existing Perl code to serve larger network, Web, enterprise, or e-commerce applications
- Rewrite, restructure, and upgrade any Perl program for improved performance
- Bring standards and best practices to your entire library of Perl software
- Organize Perl code into modules and components that are easier to reuse
- Upgrade code written for earlier versions of Perl
- Write and execute better tests for your software...or anyone else's
- Use Perl in team-based, methodology-driven environments
- Document your Perl code more effectively and efficiently
If you've ever inherited Perl code that's hard to maintain, if you write Perl code others will read, if you want to write code that'll be easier for you to maintain, the book that comes to your rescue is Perl Medic.
If you code in Perl, you need to read this book.–Adam Turoff, Technical Editor, The Perl Review.
Perl Medic is more than a book. It is a well-crafted strategy for approaching, updating, and furthering the cause of inherited Perl programs.–Allen Wyke, co-author of several computer books including JavaScript Unleashed and Pure JavaScript.
Scott's explanations of complex material are smooth and deceptively simple. He knows his subject matter and his craft-he makes it look easy. Scott remains relentless practical-even the 'Analysis' chapter is filled with code and tests to run.–Dan Livingston, author of several computer books including Advanced Flash 5: Actionscript in Action
- Sales Rank: #2618762 in Books
- Published on: 2004-03-15
- Original language: English
- Number of items: 1
- Dimensions: 9.10" h x 1.00" w x 6.90" l, 1.19 pounds
- Binding: Paperback
- 336 pages
Amazon.com Review
Perl ranks among hackers' favorite languages--there's always another approach to a problem, always optimization to be done, and forever new techniques to try. Perl's a hoot. But the culture of tinkering that surrounds Perl has resulted in a large body of hard-to-understand legacy code. That legacy code has to be maintained, extended, and adapted to new conditions--often without the help of the person who originally created it. Perl Medic considers Perl from the perspective of a programmer looking at code written by someone else and trying to answer the ancient question: "What were they thinking?"
It's a creative approach, and one that makes good reading for someone well-versed in Perl programming (author Peter Scott makes the analogy of becoming fluent in a human language, such as French, then studying its various accents and dialects). He shows, for example, a kludgy piece of code that's meant to catch CGI form uploads, then indicates that the obvious replacement is the CGI.pm module. Elsewhere, Scott shows why symbolic references are bad, and how to avoid them by means of hashes. Some of the value in this book is in the form of documentation of the differences among Perl versions; other useful coverage deals with warnings and strictness control as debugging tools. Read this straight through to improve your own code; use the index to help decipher and improve what someone else has written. --David Wall
Topics covered: How to write good Perl code, read bad Perl code, and convert bad Perl code into good in less time that would be required to write an equivalent replacement program from scratch. Testing, debugging, documenting, replacing custom code with CPAN modules, and embracing features that became available in later versions of Perl are all covered. Overall, the author endorses and generally explains the principles of Extreme Programming (XP) for Perl work.
From the Back Cover
- Cure whatever ails your Perl code!
- Maintain, optimize, and scale any Perl software... whether you wrote it or not
- Perl software engineering best practices for enterprise environments
- Includes case studies and code in a fun-to-read format
If you code in Perl, you need to read this book.—Adam Turoff, Technical Editor, The Perl Review.
Perl Medic is more than a book. It is a well-crafted strategy for approaching, updating, and furthering the cause of inherited Perl programs.—Allen Wyke, co-author of several computer books including JavaScript Unleashed and Pure JavaScript.
Scott's explanations of complex material are smooth and deceptively simple. He knows his subject matter and his craft-he makes it look easy. Scott remains relentless practical-even the 'Analysis' chapter is filled with code and tests to run.—Dan Livingston, author of several computer books including Advanced Flash 5: Actionscript in Action
Bring new power, performance, and scalability to your existing Perl code!
Today's Perl developers spend 60-80% of their time working with existing Perl code. Now, there's a start-to-finish guide to understanding that code, maintaining it, updating it, and refactoring it for maximum performance and reliability. Peter J. Scott, lead author of Perl Debugged, has written the first systematic guide to Perl software engineering. Through extensive examples, he shows how to bring powerful discipline, consistency, and structure to any Perl program-new or old. You'll discover how to:
- Scale existing Perl code to serve larger network, Web, enterprise, or e-commerce applications
- Rewrite, restructure, and upgrade any Perl program for improved performance
- Bring standards and best practices to your entire library of Perl software
- Organize Perl code into modules and components that are easier to reuse
- Upgrade code written for earlier versions of Perl
- Write and execute better tests for your software...or anyone else's
- Use Perl in team-based, methodology-driven environments
- Document your Perl code more effectively and efficiently
If you've ever inherited Perl code that's hard to maintain, if you write Perl code others will read, if you want to write code that'll be easier for you to maintain, the book that comes to your rescue is Perl Medic.
On the Web SiteDownload all of the book's sample code from .
About the Author
PETER J. SCOTT runs Pacific Systems Design Technologies, providing Perl training, application development, and enterprise systems analysis. He was a speaker on the 2002 Perl Whirl cruise and at YAPC::Canada, and he founded his local Perl Monger group. A software developer since 1981 and a Perl developer since 1992, he has also created programs for NASA's Jet Propulsion Laboratory. Scott graduated from Cambridge University, England, with a Master's of Arts Degree in Computer Science and now lives in the Pacific Northwest with his wife Grace, a cat, and a parrot, at least one of which also uses Perl. He is the lead author of Perl Debugged.
Most helpful customer reviews
0 of 0 people found the following review helpful.
Doesn't live up to it's hype.
By J. Kingsbury
The book didn't really give me any insight in how to transform legacy code to modern oop. The examples were ok but considering I bought this based on other reviews I figured it was great. It's not. Of the 30,000 lines of code I inherited in my first perl script, I may have refered to this book one time. Don't expect much help in modernizing, just seems to focus of figuring out bad code not refactoring. Maybe I'll use it as I update other scripts but for now it sits well under perl by example and camel 2nd ed.
0 of 0 people found the following review helpful.
Four Stars
By Amazon Customer
Good tips for those maintaining old Perl code.
11 of 11 people found the following review helpful.
One of the best Perl books out there
By David Cross
A quote on the front cover of this book says "if you code in Perl then you need to read this book". That's a pretty bold claim to make. It made me think of the hyperbole on covers of books that claim to teach you to program in Perl in just a few days. But this book is published by Addison Wesley, who are a well respected technical publisher of technical books and the quote is from Adam Turoff who certainly knows what he's talking about when it comes to Perl programming. So in this case the claim isn't hyperbole. The book really is one that I want every Perl programmer to read.
Perl gets a lot of bad press from people who claim that it encourages people to write unreadable code. Whilst there's certainly a lot of very bad Perl code out there I think that's more a sign that it's used by a lot of people who don't know how to program than a reflection on the language itself. And that's where this book comes in. It assumes that you are familiar with the syntax of Perl but that you've never really been shown how to use it effectively. Which is a situation that many Perl programmers find themselves in.
Perl Medic is actually targetted at people who have to maintain older Perl code written by someone else, but I think that the information it contains is just as useful to anyone coding in Perl. Peter Scott has a lot of experience in writing Perl and in training other people to write Perl and the distillation of that experience and knowledge into these 300-odd pages mean that there are few Perl programmers who won't pick up something useful from this book.
The main emphasis in the book is on increasing the maintainability of code. The techniques are wide-ranging. I particularly enjoyed the examples of refactoring programs and the coverage of using modules from CPAN. Two other very good sections are the one on antipatterns in chapter 4 and the one on cargo cult programming in chapter 6. Together these sections give a programmer a number of easy to recognise quick wins when improving existing code and a checklist of things not to do when writing new code.
There are a couple of niggles. I've already mentioned that I think the book has been slightly mis-targetted and that it should have been aimed at anyone writing Perl code. The other problem that I had was that the medic analogy that runs through the book gets a bit strained at times. But these are only minor and they shouldn't prevent you from adding this book to your library.
In fact, all in all, the quote on the front cover is pretty accurate.
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