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1. Top results related to is there a standard for perl tutorial

   • Is there a Perl solution for lazy lists this side of Perl 6?

     Top Answer

     Answered Sep 21, 2008 · 13 votes

     As mentioned previously, for(each) is an eager loop, so it wants to evaluate the entire list before starting.

     For simplicity, I would recommend using an iterator object or closure rather than trying to have a lazily evaluated array. While you can use a tie to have a lazily evaluated infinite list, you can run into troubles if you ever ask (directly or indirectly, as in the foreach above) for the entire list (or even the size of the entire list).

     Without writing a full class or using any modules, you can make a simple iterator factory just by using closures:

     sub make_iterator { my ($value, $max, $step) = @_;- return sub { return if $value > $max; # Return undef when we overflow max.- my $current = $value; $value += $step; # Increment value for next call. return $current; # Return current iterator value. };}-

     And then to use it:

     # All the even numbers between 0 - 100.my $evens = make_iterator(0, 100, 2);-while (defined( my $x = $evens->() ) ) { print "$x\n";}-

     There's also the Tie::Array::Lazy module on the CPAN, which provides a much richer and fuller interface to lazy arrays. I've not used the module myself, so your mileage may vary.

     All the best,

     Paul

     Other Answers

     Answered Sep 21, 2008 · 9 votes

     [Sidenote: Be aware that each individual step along a map/grep chain is eager. If you give it a big list all at once, your problems start much sooner than at the final foreach.]

     What you can do to avoid a complete rewrite is to wrap your loop with an outer loop. Instead of writing this:

     for my $item ( map { ... } grep { ... } map { ... } @list ) { ... }-

     … write it like this:

     while ( my $input = calculcate_next_element() ) { for my $item ( map { ... } grep { ... } map { ... } $input ) { ... }}-

     This saves you from having to significantly rewrite your existing code, and as long as the list does not grow by several orders of magnitude during transformation, you get pretty nearly all the benefit that a rewrite to iterator style would offer.

     Other Answers

     Answered May 17, 2012 · 7 votes

     If you want to make lazy lists, you'll have to write your own iterator. Once you have that, you can use something like Object::Iterate which has iterator-aware versions of map and grep. Take a look at the source for that module: it's pretty simple and you'll see how to write your own iterator-aware subroutines.

     Good luck, :)

     Check all answers on Stack Overflow

     1/5

   • Is there a good obfuscater for Perl code?

     Top Answer

     Answered Sep 16, 2008 · 31 votes

     I've been down this road before and it's an absolute nightmare when you have to work on "obfuscated" code because it drives up costs tremendously trying to debug a problem on the client's server when you, the developer, can't read the code. You wind up with "deobfuscators", copying the "real code" to the client's server or any of a number of other issues which just become a real hassle to maintain.

     I understand where you're coming from, but it sounds like management has a problem and they're looking to you to implement a chosen solution rather than figuring out what the correct solution is.

     In this case, it sounds like it's really a licensing or contractual issue. Let 'em have the code open source, but make it a part of the license that any changes they submit have to come back to you and be approved. When you push out patches, check the md5 sums of all code and if it doesn't match what's expected, they're in license violation and will be charged accordingly (and it should be a far, far higher rate). (I remember one company which let us have the code open source, but made it clear that if we changed anything, we've "bought" the code for $25,000 and they were no longer responsible for any bug fixes or upgrades unless we bought a new license).

     Other Answers

     Answered Sep 21, 2008 · 9 votes

     [Sidenote: Be aware that each individual step along a map/grep chain is eager. If you give it a big list all at once, your problems start much sooner than at the final foreach.]

     What you can do to avoid a complete rewrite is to wrap your loop with an outer loop. Instead of writing this:

     for my $item ( map { ... } grep { ... } map { ... } @list ) { ... }-

     … write it like this:

     while ( my $input = calculcate_next_element() ) { for my $item ( map { ... } grep { ... } map { ... } $input ) { ... }}-

     This saves you from having to significantly rewrite your existing code, and as long as the list does not grow by several orders of magnitude during transformation, you get pretty nearly all the benefit that a rewrite to iterator style would offer.

     Other Answers

     Answered May 17, 2012 · 7 votes

     If you want to make lazy lists, you'll have to write your own iterator. Once you have that, you can use something like Object::Iterate which has iterator-aware versions of map and grep. Take a look at the source for that module: it's pretty simple and you'll see how to write your own iterator-aware subroutines.

     Good luck, :)

     Check all answers on Stack Overflow

     2/5

   • Is there a Perl extension for Visual Studio?

     Top Answer

     Answered Mar 22, 2023 · 13 votes

     Visual Studio Update 1 RTM now (2015) has Perl support, along with Go, Java, R, Ruby, and Swift.

     Check all answers on Stack Overflow

     3/5

   • Is there a core Perl module for SSL/TLS support?

     Top Answer

     Answered May 19, 2017 · 11 votes

     SSL/TLS support is provided by Net::SSLeay and IO::Socket::SSL. Modules such as HTTP::Tiny and LWP interface with the OpenSSL routines via those layers.

     There is no core or pure Perl module supporting HTTPS.

     Check all answers on Stack Overflow

     4/5

   • Is there a better way to remove a string for an array of strings in perl?

     Top Answer

     Answered Dec 04, 2012 · 5 votes

     You don't need the assignment in this line:

     ($test_array[$i] = $test_array[$i]) =~ s{http://}{};-

     you can just use:

     $test_array[$i] =~ s{http://}{};

     For even less typing, take advantage of the $_ variable:

     for (@test_array) { s{http://}{};}

     Check all answers on Stack Overflow

     5/5

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2. www.geeksforgeeks.org › perl-tutorial-learn-perlPerl Tutorial - Learn Perl With Examples - GeeksforGeeks

   www.geeksforgeeks.org › perl-tutorial-learn-perl

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   Oct 27, 2021 · The three basic FileHandles in Perl are STDIN, STDOUT, and STDERR, which represent Standard Input, Standard Output, and Standard Error devices respectively. Reading from and Writing to a File using FileHandle

3. www.perltutorial.orgPerl Tutorial

   www.perltutorial.org

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   Section 2. Basic Perl Tutorial. In this section, you’ll learn about Perl fundamentals including basic syntax, variables, operators. Syntax – teaches you basic syntax in Perl including values, variables, expressions, statements, blocks, comments, whitespaces, and keywords. Variables – explains to you the variables, variable scopes, and ...

4. Videos

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5. www.tutorialspoint.com › perlPerl Tutorial

   www.tutorialspoint.com › perl

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   Perl Tutorial - Perl is a programming language developed by Larry Wall, especially 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. This tutorial provides a complete understanding on Pe.

   Code sample

   #!/usr/bin/perl

   # This will print "Hello, World"

   print "Hello, world\n";

   See more on tutorialspoint

6. www.perltutorial.org › introduction-to-perlIntroduction to Perl - Perl Tutorial

   www.perltutorial.org › introduction-to-perl

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   3) Perl is an easy-to-use language. Perl is intended to be efficient and complete rather than elegant and minimal. Perl supports some major programming paradigms including object-oriented, procedural, and functional. One of the most remarkable features of Perl is text manipulation. Perl comes with a set of powerful APIs for processing text that ...

7. People also ask

   What is a BASIC Perl tutorial?

   • Basic Perl Tutorial In this section, you’ll learn about Perl fundamentals including basic syntax, variables, operators Syntax – teaches you basic syntax in Perl including values, variables, expressions, statements, blocks, comments, whitespaces, and keywords. Variables – explains to you the variables, variable scopes, and variable interpolation.

   Perl Tutorial

   www.perltutorial.org/

   See all results for this question

   How do I learn Perl?

   • First, get started quickly with Perl by following the introduction to Perl programming language. Second, set up a Perl development environment for practicing Perl programming. Third, develop the first program in Perl. Section 2. Basic Perl Tutorial In this section, you’ll learn about Perl fundamentals including basic syntax, variables, operators

   Perl Tutorial

   www.perltutorial.org/

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   Is Perl easy to learn?

   • Easy to start: Perl is a high-level language so it is closer to other popular programming languages like C, C++ and thus, becomes easy to learn for anyone.

   Perl Tutorial - Learn Perl With Examples - GeeksforGeeks

   www.geeksforgeeks.org/perl-tutorial-learn-perl-with-examples/

   See all results for this question

   What programming paradigms does Perl support?

   • Perl supports some major programming paradigms including object-oriented, procedural, and functional. One of the most remarkable features of Perl is text manipulation. Perl comes with a set of powerful APIs for processing text that makes it perfect for working with XML, HTML, and other markup languages.

   Introduction to Perl - Perl Tutorial

   www.perltutorial.org/introduction-to-perl/

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8. learn.perl.org › tutorialsPerl Tutorials - learn.perl.org

   learn.perl.org › tutorials

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   Many tutorials are available if you are interested in learning Perl. Please note that these tutorials are introductions. For reference material, please look at the perl documentation, either online or using the perldoc command (try perldoc perlintro).

9. opensource.com › article › 22Learn Perl in 2022 | Opensource.com

   opensource.com › article › 22

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   Feb 10, 2022 · February 10, 2022 | 5 Comments | 9 min read. 50 readers like this. Image by: Ray Smith. Released in early 1988, Perl is a postmodern programming language often considered a scripting language, but it is also capable of object-oriented programming.

10. www.perl.org › books › beginning-perlBeginning Perl (free) - www.perl.org

    www.perl.org › books › beginning-perl

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    What does this book cover? Installing Perl on Windows and UNIX. Making use of online Perl resources like CPAN. First principles in programming and the Perl syntax. Working with files and databases. Writing web pages in Perl. Using Perl as an object-oriented language. Book overview.