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This section is an ever-growing online textbook, from which you can learn the basics of Perl, or some nifty stuff you haven't seen before. Should I post here? While you can post directly to the Tutorials section, this has certain drawbacks. A generally better approach is to follow this procedure: Write up your draft tutorial and put it in your scratchpad; broadcast requests for comments in the cha
$client has a script that needed minimal module support, but wants to parse JSON. Couldn't find anything like YAML::Tiny (which I borrowed to remove the YAML dependency), so I hacked up this regex to parse and extract JSON. Doesn't handle unicode yet, but that wasn't a client requirement. #!/usr/bin/env perl use Data::Dumper qw(Dumper); my $FROM_JSON = qr{ (?&VALUE) (?{ $_ = $^R->[1] }) (?(DEFINE)
[ UPDATE 27 Aug 2009: Readers interested in the topic of this node will want to look first (or instead) at the series of three articles I wrote for The Perl Review, now available online. They lay this proof out more carefully and with thorough explanations, in three different versions. ] [ At this point this post should be considered mainly of historical interest. One especial defect is that it fr
Okay.. fair warning: I'm venting. I just had an long and very frustrating conversation with a young programmer who recently discovered functional programming, and thinks it can solve every problem in the world. Before I go any farther, let me make one thing clear: I do not hate functional programming. On the contrary, I agree with every guru out there who says that you can't become a Real Programm
Introduction Throughout its history, Perl has always found a home in the suite of tools employed by system administrators in the maintenance, monitoring and administration of computer systems. As the diversity of demands and requirements placed upon computer systems has grown, so too has the requirement for system administrators to take full advantage of the tools at their disposal. In this respec
This came up on perl5-porters this week: The question is, when does the object get destroyed given this code? if (my $object = Foo->new) {} print "after if\n"; package Foo; sub new { my $self = bless {},shift; print "CREATED $self\n"; $self } sub DESTROY { print "DESTROYED $_[0]\n" }
good chemistry is complicated, and a little bit messy -LW Introduction I need to compile Perl modules for Windows. In particular I want to compile Gtk2, but it would seem that it's one of the hardest to compile. The easy answer of course is to install PPM (randyk tells us how to do it without a working compiler.), but that relies on someone else having a working compiling environment and the same
Recipe Attach gdb to the processgdb -p YOUR-PID Advance perl to a point between opcodes. This step may be optional but is a good idea. Omitting this step risks corrupting something. This is semi-equivalent to an "unsafe perl signal." set variable PL_sig_pending = 1 b Perl_despatch_signals c Run arbitrary perl. This returns a number which is a (SV*). You'll use this pointer in the next step. See Ho
MimisIVI has asked for the wisdom of the Perl Monks concerning the following question: Hi Monks, I build a Search engine which use an inverted index. For small number of documents is quiet fast but not for large ... The solution is to compress the data that i am saving in the index but i have problem to understand the two most helpfull Perl's functions (pack and unpack)... The are a lot of compres
Dear Monks, I'd just like to briefly mention YAPC::Asia which was held last week in Tokyo. Follow the link to the English page which has a list of speakers and sessions, and temporary links to slides and audio. (A video camera was set up so that data is to go online.) As of this posting the links are: slides and audio files (heavy page). Senna and the web crawler Xango, and search big chat sites)
Those of us who have learned the DBI from the book, or from the official perldoc some versions ago, may not have noticed that the DBI, in recent versions, has added several new features and improved existing ones. This is my case, anyway. I started working with the DBI from version 1.13, and only recently I opened my eyes to a whole new set of improvements. This article discusses some of such feat
I will update this post when the other talks are posted. Over the next week we'll be putting together a full summary that includes updates for everything Science Perl, lessons learned, including plans for next year (abstracts for 2025 are being accepted now, information on purchasing a dead tree 2024 Science Perl Journal, etc). Special thanks again to the TPRC Planning Committee for giving us this
Clear questions and runnable code get the best and fastest answer Programming with the DBI becomes a matter of habit. You may choose to code directly with the DBI rather than using on of the many wrappers available on CPAN because of efficiency concerns, or because you are dealing with legacy code, or simply because you want to have a grip at the core of things. Whichever reason for using the DBI
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