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内容紹介
This book is about taking over Perl code, whether written by someone else or by yourself at an earlier time. Developers regularly estimate that they spend 60 to 80 percent of their time working with existing code. Many problems of code inheritance are common to all languages, but the nature of the language makes Perl especially tricky. The reason why is that Perl is similar to English - bursting with irregular verbs, consistent only when it's convenient, borrowing terms from other languages, and providing many ways to say the same thing. In fact, Perl developers have a motto with the abbreviation TMTOWTDI: There's More Than One Way To Do It. While this flexibility is one of the language's strengths, it also makes it extremely difficult when you are faced with an existing piece of code. There are millions of lines of Perl code being used all over the Web; much of it was built on an ad hoc basis, the creators never imagining that the code would still be in use months or years later. This book will be the resource all Perl programmers need to understand someone else's code, even when it's bad; repair it; convert it to a better style; upgrade it to the latest version of Perl; maintain it; and find and fix its bugs.
著者について
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.
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5つ星のうち 4.4
7件のカスタマーレビュー
17 人中、16人の方が、｢このレビューが参考になった｣と投票しています。
5つ星のうち 5.0
Novel and effective tutorial in solid Perl Programming
2004/3/18
By Jack D. Herrington
- (Amazon.com)
形式:ペーパーバック
You can learn a lot from books (or so it seems), but you can't learn a feel for the language. I had read all of the O'Reily Perl books and found myself in charge of a large Perl project writing new code. I hired on a real Perl guru and he taught me a ton, in person, about how to write Perl as Perl and do it well. What amazes me about Perl Medic is how much of what the Perl guru taught me is in this book. It's as if I had the man by my side again.
On it's face that makes it sound like you should pick up the book immediately. And for someone who is serious about Perl I think you should get this book. But there are still some faults. It could be a little better organized. And some of the common problems, like CGI scripts having embedded HTML, could be given more prominence and the text templating alternative given some more space. I looked in the tiny index for HTML::Template and found only two references, both of which were pretty short.
In what is probably both a curse and a blessing the book is not only about fixing legacy code. The majority of the book is about becoming a better Perl programmer and writing Perl as Perl. There are a few chapters and the beginning and end that are specifically about working with legacy code, but the majority of the book is practical insights into Perl coding styles using code fragments with effective exposition.
Small problems aside. This unique book is fun to read and is packed with valuable insights if you spend the time to look. The author obviously knows a lot about Perl and understands how to convey that knowledge to the reader effectively. If you are looking to maintain some Perl, or if you have hit a plateau in your understanding of Perl and you need a push to get to a higher level this book is for you.
11 人中、11人の方が、｢このレビューが参考になった｣と投票しています。
5つ星のうち 5.0
One of the best Perl books out there
2004/6/24
By David Cross
- (Amazon.com)
形式:ペーパーバック
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.
8 人中、8人の方が、｢このレビューが参考になった｣と投票しています。
5つ星のうち 5.0
A good book with a misleading title
2004/5/19
By Kenneth Graves
- (Amazon.com)
形式:ペーパーバック
While the "medic" metaphor recurs throughout the book, most of the material isn't directly related to repairing old code. Instead, this is a collection of best practices for new code. (The author recommends rewriting existing code if at all possible.) It ends up resembling another excellent Perl title, Joseph Hall's Effective Perl Programming. Good company to keep. Perl Medic has the advantage of being newer, and of covering a bit more material. The writing style is very easy to read, and the order of presentation works well. An excellent title for any intermediate-level Perl programmer.
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