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Technical articles with clear explanations and examples
How to run Perl Program?
The following are the different ways to start Perl.Interactive InterpreterYou can enter Perl and start coding right away in the interactive interpreter by starting it from the command line. You can do this from Unix, DOS, or any other system, which provides you a command-line interpreter or shell window.$perl -e # Unix/Linux or C:>perl -e # Windows/DOSHere is the list of all the available command-line options −Sr.No.Option & Description1-d[:debugger]Runs program under a debugger2-IdirectorySpecifies @INC/#include directory3-TEnables tainting checks4-tEnables tainting warnings5-UAllows unsafe operations6-wEnables many useful warnings7-WEnables all ...
Read MorePerl Installation on Macintosh Platform
In order to build your own version of Perl, you will need 'make', which is part of the Apple developer tools usually supplied with Mac OS install DVDs. You do not need the latest version of Xcode (which is now charged for) in order to install make.Here are the simple steps to install Perl on Mac OS X machine.Open a Web browser and go to https://www.perl.org/get.html.Follow the link to download the zipped source code available for Mac OS X.Download the perl-5.x.y.tar.gz file and issue the following commands at $ prompt.$tar -xzf perl-5.x.y.tar.gz $cd perl-5.x.y $./Configure -de $make $make test $make ...
Read MorePerl Installation on Unix and Linux Platform
Here are the simple steps to install Perl on Unix/Linux machine.Open a Web browser and go to https://www.perl.org/get.html.Follow the link to download the zipped source code available for Unix/Linux.Download the perl-5.x.y.tar.gz file and issue the following commands at $ prompt.$tar -xzf perl-5.x.y.tar.gz $cd perl-5.x.y $./Configure -de $make $make test $make installNOTE − Here $ is a Unix prompt where you type your command, so make sure you are not typing $ while typing the above-mentioned commands.This will install Perl in a standard location /usr/local/bin and its libraries are installed in /usr/local/lib/perlXX, where XX is the version of Perl that you ...
Read MorePerl is Interpreted or Compiled Language?
Perl is an interpreted language, which means that your code can be run as-is, without a compilation stage that creates a non-portable executable program.Traditional compilers convert programs into machine language. When you run a Perl program, it's first compiled into a byte code, which is then converted ( as the program runs) into machine instructions. So it is not quite the same as shells, or Tcl, which are strictly interpreted without an intermediate representation.It is also not like most versions of C or C++, which are compiled directly into a machine-dependent format. It is somewhere in between, along with Python ...
Read MorePerl and the Web
Perl is a general-purpose programming language originally developed for text manipulation and now used for a wide range of tasks including system administration, web development, network programming, GUI development, and more.Perl used to be the most popular web programming language due to its text manipulation capabilities and rapid development cycle.Perl is widely known as "the duct-tape of the Internet".Perl can handle encrypted Web data, including e-commerce transactions.Perl can be embedded into web servers to speed up processing by as much as 2000%.Perl's mod_perl allows the Apache webserver to embed a Perl interpreter.Perl's DBI package makes web-database integration easy.
Read MoreWhat is Perl Programming Language?
Perl is a general-purpose programming language originally developed for text manipulation and now used for a wide range of tasks including system administration, web development, network programming, GUI development, and more.Perl is a stable, cross-platform programming language.Though Perl is not officially an acronym few people used it as Practical Extraction and Report Language.It is used for mission-critical projects in the public and private sectors.Perl is an Open Source software, licensed under its Artistic License, or the GNU General Public License (GPL).Perl was created by Larry Wall.Perl 1.0 was released to Usenet's alt.comp.sources in 1987.At the time of writing this tutorial, ...
Read MoreWhat are the Features of Perl Language?
Perl is a programming language developed by Larry Wall, specially designed for text processing. There are following great feature of Perl LanguagePerl takes the best features from other languages, such as C, awk, sed, sh, and BASIC, among others.Perl's database integration interface DBI supports third-party databases including Oracle, Sybase, Postgres, MySQL, and others.Perl works with HTML, XML, and other mark-up languages.Perl supports Unicode.Perl is Y2K compliant.Perl supports both procedural and object-oriented programming.Perl interfaces with external C/C++ libraries through XS or SWIG.Perl is extensible. There are over 20, 000 third party modules available from the Comprehensive Perl Archive Network (CPAN).The Perl ...
Read MoreWhy to Learn Perl?
Perl is a programming language developed by Larry Wall, specially designed for text processing. It stands for Practical Extraction and Report Language. It runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX Following great features make this language necessary for the Programmers to learn −Perl is a stable, cross-platform programming language.Though Perl is not officially an acronym few people used it as Practical Extraction and Report Language.It is used for mission-critical projects in the public and private sectors.Perl is an Open Source software, licensed under its Artistic License, or the GNU General ...
Read MoreWhat is the reason to choose jasmine over jest?
There is no solid reason to choose jasmine over jest. Both are excellent libraries that have been around for a while and have an opinionated way of doing things that are quite similar. Jest is built on top of jasmine.One reason why you might choose jasmine over jest is that it is faster. (https://github.com/facebook/jest/issues/6694)
Read MoreHow to check if element exists in the visible DOM?
We can use the Node.contains method to do this check. The Node.contains() method returns a Boolean value indicating whether a node is a descendant of a given node, i.e. the node itself, one of its direct children (childNodes), one of the children's direct children, and so on.ExampleFor example, you are looking for an element with id test, you can use the following −const elem = document.querySelector('#test'); console.log(document.body.contains(elem));This will log true or false based on whether the element is present in the visible DOM.
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