The underlying assumption is that using a comma would mean that only the final value in the parentheses was passed on to print. Most of all, Perl Best Practices offers guidelines that actually work, and that many developers around the world are already using. An important exception to the preceding rules is the empty string. Instead, immediately add those tests to your test suite. So don't use them at all. Don't write one-character strings in visually ambiguous ways. After all, it looks right.
After all, leaving the tests off almost always works just fine. Most of all, Perl Best Practices offers guidelines that actually work, and that many developers around the world are already using. In addition to covering the essential material, Conway's book discusses some of the darker recesses features? And not just over source code: you should be revision controlling your documentation, and data files, and document templates, and makefiles, and style sheets, and change logs, and any other resources your system requires. Even though leading zeros aren't significant in mathematics, they are significant in Perl. Not the popular version, but the original.
Adopting a coherently designed approach to code layout, and then applying that approach consistently across all your coding, is fundamental to best-practice programming. I recommend this book to anyone who prefers getting on with the job rather than going back and fixing errors caused by syntax and poor style issues. Damian finds that naming his references in a self-indicative way helps him and readers of his code, no doubt identify them and reduce coding mistakes. 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. Testing and debugging -- 19. With a good dose of Aussie humor, Dr. The only real problem with Perl Best Practices is that there's no way to force other Perl programmers to read it.
In tackling this problem head-on, Damian Conway is nothing if not brave. What's the advantage to me for adding those extra four characters? They're focused entirely on problems they're solving, solutions they're creating, and algorithms they're implementing. That justification can also compromise your code's indentation structure. 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. Yes, some of the suggestions in the book would be helpful -- but if you're only writing the occasional quick and dirty script as many do it's probably not worth the investment.
It is the vertical gaps separating each paragraph that are critical. A fair amount of the advice in the book would apply to programming in any language. Or 42: the number of gallons per barrel of oil? These examples will not be wasted when the design is complete. They're focused entirely on problems they're solving, solutions they're creating, and algorithms they're implementing. Perl code can be overtly terse or roun Hardcore Perl programmers tend to be an audacious bunch. The book is written in a conversational tone, with a little humor thrown in for good measure.
The chapters are organized by topic, rather than importance -- but Appendix A breaks them down into the 10 best development practices, 10 best coding practices, and 10 best module practices. The jokes, when they come, often are something special. Raw numbers that suddenly appear in the middle of a program are often mysterious, frequently confusing, and always a potential source of errors. 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. The issue that he mentions is not a problem for me because most of my variables have a small scope, so I'm unlikely to have 2 with the same name in scope.
Use a Revision Control System Maintaining control over the creation and modification of your source code is utterly essential for robust team-based development. I will give it a go. Even if you don't intend to follow all of the practices, thinking through your style will improve it. Much like Perl itself, these guidelines are about helping you to get your job done, without getting in the way. . This enables your users to take advantage of existing knowledge—instead of continually asking you. Delimiters can be just about anything you like.
With a good dose of Aussie humor, Dr. You should also avoid using quotation marks when specifying a single comma character. Update: Changed singular to plural per private note from. I should also mention that I enjoyed Conway's writing style. This book is a masterpiece! But my personal style has been evolving to use fewer and fewer real arrays and hashes, and the potential for mishap disappears if everything is a ref or at least a scalar. Stay Connected to O'Reilly Media by Email - Follow O'Reilly Media:.