By Damian Conway
Many programmers code by means of intuition, hoping on handy conduct or a "style" they picked up early on. They aren't aware of the entire offerings they make, like how they layout their resource, the names they use for variables, or the types of loops they use. They're targeted totally on difficulties they're fixing, ideas they're developing, and algorithms they're imposing. in order that they write code within the approach that turns out traditional, that occurs intuitively, and that feels good.
but when you're excited about your occupation, instinct isn't adequate. Perl top Practices writer Damian Conway explains that principles, conventions, criteria, and practices not just support programmers converse and coordinate with each other, in addition they supply a competent framework for considering difficulties, and a typical language for expressing strategies. this is often in particular severe in Perl, as the language is designed to provide many ways to complete an analogous activity, and accordingly it helps many incompatible dialects.
With an exceptional dose of Aussie humor, Dr. Conway (familiar to many within the Perl neighborhood) bargains 256 instructions at the artwork of coding that can assist you write greater Perl code--in truth, the easiest Perl code you can still. the ideas hide code structure, naming conventions, number of info and regulate constructions, software decomposition, interface layout and implementation, modularity, item orientation, mistakes dealing with, checking out, and debugging.
They're designed to interact to supply code that's transparent, strong, effective, maintainable, and concise, yet Dr. Conway doesn't fake that this can be the only precise common and unequivocal set of most sensible practices. as a substitute, Perl most sensible Practices bargains coherent and broadly appropriate feedback in response to real-world event of ways code is absolutely written, instead of on someone's ivory-tower theories on how software program must be created.
such a lot of all, Perl most sensible Practices bargains instructions that really paintings, and that many builders worldwide are already utilizing. very like Perl itself, those guidance are approximately supporting you to get your task performed, with no going in the way.
compliment for Perl top Practices from Perl group members:
"As a supervisor of a big Perl undertaking, I'd make sure that each member of my group has a duplicate of Perl most sensible Practices on their table, and use it because the foundation for an in-house kind guide." -- Randal Schwartz
"There are not any extra excuses for writing undesirable Perl courses. All degrees of Perl programmer may be extra efficient after examining this book." -- Peter Scott
"Perl top Practices often is the subsequent gigantic vital ebook within the evolution of Perl. the tips and practices Damian lays down may also help deliver Perl out from lower than the embarrassing heading of "scripting languages". many people have identified Perl is a true programming language, necessary of all of the projects in most cases delegated to Java and C++. With Perl most sensible Practices, Damian exhibits particularly how and why, so everybody else can see, too." -- Andy Lester
"Damian's performed what many notion very unlikely: exhibit tips to construct huge, maintainable Perl purposes, whereas nonetheless letting Perl be the robust, expressive language that programmers have enjoyed for years." -- invoice Odom
"Finally, a way to convey lasting order to the method and manufactured from genuine Perl improvement teams." -- Andrew Sundstrom
"Perl most sensible Practices offers a invaluable schooling in tips to write powerful, maintainable Perl, and is a definitive quotation resource whilst training different programmers." -- Bennett Todd
"I've been educating Perl for years, and locate an analogous query retains being requested: the place am i able to discover a reference for writing reusable, maintainable Perl code? ultimately i've got a good answer." -- Paul Fenwick
"At final a good researched, good thought-out, entire advisor to Perl kind. rather than every one folks constructing our personal, we will be able to examine sturdy practices from one in all Perl's so much prolific and skilled authors. i like to recommend this booklet to an individual who prefers getting on with the task instead of going again and solving mistakes as a result of syntax and bad kind issues." -- Jacinta Richardson
"If you care approximately programming in any language learn this publication. no matter if you don't intend to stick to the entire practices, pondering via your kind will increase it." -- Steven Lembark
"The Perl community's top writer is again with one other notable booklet. There hasn't ever been a finished reference on prime quality Perl coding and elegance till Perl top Practices. This e-book fills a wide hole in each Perl bookshelf." -- Uri Guttman
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Extra resources for Perl Best Practices
Example text
26, No. 11, pp. 861–867). † But don’t do that! If you need more than four or five levels of indentation, you almost certainly need to factor some of that nested code out into a subroutine or module. See Chapters 9 and 17. 20 | Chapter 2: Code Layout This is the Title of the Book, eMatter Edition Copyright © 2009 O’Reilly & Associates, Inc. All rights reserved. else’s differently tabspaced editor. = $var_name; » » » my $quotemeta = $need_quotemeta ? {join q{|}, $quotemeta \@{$var_name}})}; » push @perl5pats, $perl5pat; » } return; The only reliable, repeatable, transportable way to ensure that indentation remains consistent across viewing environments is to indent your code using only spaces.
Then indent one level, and place the assignment operator at the start of the next line—once again indicating a continued statement: $predicted_val = $average + $predicted_change * $fudge_factor; Note that this approach often allows the entire righthand side of an assignment to be laid out on a single line, as in the preceding example. However, if the righthand expression is still too long, break it again at a low-precedence operator, as suggested in the previous guideline: $predicted_val = ($minimum + $maximum) / 2 + $predicted_change * max($fudge_factor, $local_epsilon); 30 | Chapter 2: Code Layout This is the Title of the Book, eMatter Edition Copyright © 2009 O’Reilly & Associates, Inc.
All rights reserved. | 31 that the various possible results of the ternary also form a column. Finally, indent the last result (which has no preceding question mark) so that it too lines up in the results column. This special layout converts the typical impenetrably obscure ternary sequence into a simple look-up table: for a given condition in column one, use the corresponding result from column two. You can use the tabular layout even if you have only a single ternary: my $name = defined $customer{name} ?