The Perl Data Structures Cookbook by Tom Christiansen< tchrist@perl.com > release 0.2 Sunday, 8 October 1995 This is a cookbook of recipes for building up complex data structures in perl. The PDSC currently has these parts: General Tips: recipes or expanded version Lists of Lists: recipes expanded version Hashes of Lists: recipes Lists of Hashes: recipes Hashes of Hashes: recipes Heterogeneous Records: recipes Recursive Data Structures: (unwritten, but you might consider looking at the Patricia module and its test driver for a sample of this.)
Perl Modules <div class="noscript"><p><strong>Please note: Many features of this site require JavaScript. You appear to have JavaScript disabled, or are running a non-JavaScript capable web browser.</strong></p><p> To get the best experience, please enable JavaScript or download a modern web browser such as <a href=" Explorer 8</a>, <a href=" <a href=" or <a href=" Chrome</a>. perlmod - Perl modules (packages and symbol tables) Packages Perl provides a mechanism for alternative namespaces to protect packages from stomping on each other's variables. The old package delimiter was a single quote, but double colon is now the preferred delimiter, in part because it's more readable to humans, and in part because it's more readable to emacs macros. Symbol Tables *dick = *richard; prints: #!
Hashes of Arrays (Programming Perl) Use a hash of arrays when you want to look up each array by a particular string rather than merely by an index number. In our example of television characters, instead of looking up the list of names by the zeroth show, the first show, and so on, we'll set it up so we can look up the cast list given the name of the show. Because our outer data structure is a hash, we can't order the contents, but we can use the sort function to specify a particular output order. 9.2.1. Composition of a Hash of Arrays You can create a hash of anonymous arrays as follows: # We customarily omit quotes when the keys are identifiers. To add another array to the hash, you can simply say: $HoA{teletubbies} = [ "tinky winky", "dipsy", "laa-laa", "po" ]; 9.2.2. Here are some techniques for populating a hash of arrays. flintstones: fred barney wilma dino jetsons: george jane elroy simpsons: homer marge bart you could use either of the following two loops: You can append new members to an existing array like so: 9.2.3.
Posts CSS Query (I've been out of practice) James Robert Gardiner Hi guys, I've been majorly out of practice with website development, and I'm currently developing a website for a friend of mine. Essentially he wants a scrolling website with anchor links, which is fine. Basically I have whipped up a pretty awesome background for him, and have even got it to fit to the page using background size to "cover".. Now my only query is, is it possible to get the background image to A, stretch the screensize - while B, following the user's scrolling, as it's going to be a lengthy website I don't just want the background to end...
CamelBones, an Objective-C/Perl bridge for Mac OS X & GNUSt App::cpanminus - get, unpack, build and install modules from CPAN App::cpanminus - get, unpack, build and install modules from CPAN Run cpanm -h or perldoc cpanm for more options. cpanminus is a script to get, unpack, build and install modules from CPAN and does nothing else. It's dependency free (can bootstrap itself), requires zero configuration, and stands alone. There are several ways to install cpanminus to your system. Package management system There are Debian packages, RPMs, FreeBSD ports, and packages for other operation systems available. Installing to system perl You can also use the latest cpanminus to install cpanminus itself: This will install cpanm to your bin directory like /usr/local/bin (unless you configured INSTALL_BASE with local::lib), so you probably need the --sudo option. Installing to local perl (perlbrew) If you have perl in your home directory, which is the case if you use tools like perlbrew, you don't need the --sudo option, since you're most likely to have a write permission to the perl's library path. perl 5.8 or later.
Hashes Hashes are complex list data, like arrays except they link a key to a value. To define a hash, we use the percent (%) symbol before the name. defineahash.pl: #! Display: Nickel5Dime10Quarter25 Hashes can be indexed using two scalar variables. legiblehash.pl: #! Nickel, 5 Dime, 10 Quarter, 25 The each() function takes a hash. Hashes work really well with HTML Tables. tablehashes.pl: #! We have yet to sort our hash so you may experience different arrangements of your keys than shown in the display box. Sorting any hash requires the use of the sort() function that has previously been outlined in PERL Arrays. sortkeys.pl: Dime: 10 Nickel: 5 Quarter: 25 The $coins($key) represents the variable assigned by PERL to each value of each element. Hashes may be sorted by value. We need to edit our hash to and change is the values to floating-point numbers. sortvalues.pl: #! Nickel 0.05 Dime 0.1 Quarter 0.25 Adding a new key/value pair can be done with one line of code. addelements.pl: #! removeelements.pl: #!
Free Source Code and Scripts Downloads Unicode-processing issues in Perl and how to cope with it (ahine Perl 5.8+ has comprehensive support for Unicode and a wide range of different text encodings. But still many people experience problems when processing multi-language text. Here I explain the most common problems and offer solutions. 21 Nov 2013. Some inaccuracies in the text of the article and in the test scripts were corrected. This article is translated to Serbo-Croatian language by Anja Skrba from Webhostinggeeks.com. An older version of this article is available. You can read this piece and dive into all the technical details and idiosyncrasies of perl and unicode. A bunch of perldoc manpages outline and explain the Perl’s unicode support. perluniintro, perlunicode, Encode module, binmode() function. I have experienced several kinds of trouble with Unicode in Perl, in several projects. UTF-8 data getting double-encoded or other-encoding data getting mangled the “Wide character in print” warning These two problems are closely related and often solved by similar moves. #! source #! source #!
Formation Perl - Guide Perl : tables de hachage Dernière version sur © 2002-2015 Sylvain Lhullier - Permission est accordée de copier et distribuer ce document sans modification et à condition de fournir un lien vers la page 6. Tables de hachage Les tables de hachage de Perl ne se retrouvent pas dans beaucoup d'autres langages ; pour les avoir souvent utilisées en Perl, il est dur de repasser à des langages qui n'en sont pas pourvus. Une table de hachage (hash table en anglais) est un type de donnée en Perl permettant d'associer une valeur à une clef. On peut dire d'un tableau (notion abordée précédemment) qu'il associe une valeur scalaire à un entier : à la position i (pour i entier), une certaine valeur scalaire est présente. Je peux, par exemple, avoir envie de gérer en Perl un index téléphonique simple : chacun de mes amis a un numéro de téléphone, je veux pouvoir retrouver leur numéro à partir de leur prénom. 6.1. my %h; my %h = (); 6.2. 6.3. 6.4.