Posts in this category
- Strings, Arrays, Hashes;
- Basic Control Structures
- Subroutines and Signatures
- Objects and Classes
- Regexes (also called "rules")
- Comparing and Matching
- Containers and Values
- Where we are now - an update
- Changes to Perl 5 Operators
- Custom Operators
- The MAIN sub
- Regexes strike back
- A grammar for (pseudo) XML
- Subset Types
- The State of the implementations
- Quoting and Parsing
- The Reduction Meta Operator
- The Cross Meta Operator
- Exceptions and control exceptions
- Common Perl 6 data processing idioms
Sun, 21 Sep 2008
"Perl 5 to 6" - Introduction
Learn Perl 6 (if you already know Perl 5) Learn to love Perl 6 Understand why
Perl 6 is under-documented. That's no surprise, because (apart from the specification) writing a compiler for Perl 6 seems to be much more urgent than writing documentation that targets the user.
Unfortunately that means that it's not easy to learn Perl 6, and that you have to have a profound interest in Perl 6 to actually find the motivation to learn it from the specification, IRC channels or from the test suite.
This project, which I'll preliminary call "Perl 5 to 6" (for lack of a better name) attempts to fill that gap with a series of short articles.
Each lesson has a rather limited scope, and tries to explain the two or three most important points with very short examples. It also tries to explain why things changed from Perl 5 to 6, and why this is important. I also hope that the knowledge you gain from reading these lessons is enough to basically understand the Synopses, which are the canonical source of all Perl 6 wisdom.
To keep the reading easy, each lesson should not exceed 200 lines or 1000 words (but it's a soft limit).
Perhaps the lessons are too short to learn a programming language from them, but I hope that they draw an outline of the language design, which allows you to see its beauty without having to learn the language.
This is not a guide for converting Perl 5 to Perl 6 programs. It is also not a comprehensive list of differences.
It is also not oriented on the current state of the implementations, but on the ideal language as specified.
Already written or in preparation:
00 Intro 01 Strings, Arrays, Hashes 02 Types 03 Control structures 04 Subs and Signatures 05 Objects and Classes 06 Contexts 07 Rules 08 Junctions 09 Comparisons and Smartmatching 10 Containers and Binding 11 Basic Operators 12 Laziness (-) 13 Custom Operators (-) 14 the MAIN sub 15 Twigils 16 Enums 17 Unicode (-) 18 Scoping 19 More Regexes 20 A Grammar for XML 21 Subset types 22 State of the Implementations 23 Quoting and Parsing (-) 24 Recude meta operator 25 Cross meta operator 26 Exceptions and control exceptions
(Things that are not or mostly not implemented in Rakudo are marked with
Things that I want to write about, but which I don't know well enough yet:
Macros Meta Object Programming Concurrency IO
Things that I want to mention somewhere, but don't know where
I'll also update these lessons from time to time make sure they are not too outdated.
Moritz Lenz, http://perlgeek.de/,
Other documentation efforts can be found on http://perl6.org/documentation/.