Randal L. Schwartz - Intermediate Perl
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Intermediate Perl: summary, description and annotation
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This book picks up right where Learning Perl leaves off. With Intermediate Perl, youll graduate from short scripts to much larger programs, using features that make Perl a general-purpose language. This gentle but thorough guide introduces you to modules, complex data structures, and object-oriented programming.
Each chapter is small enough to be read in just an hour or two, ending with exercises to help you practice what youve learned. If youre familiar with the material in Learning Perl and have the ambition to go further, Intermediate Perl will teach you most of the core Perl language concepts you need for writing robust programs on any platform.
Topics include:
- Packages and namespaces
- References and scoping, including regular expression references
- Manipulating complex data structures
- Object-oriented programming
- Writing and using modules
- Testing Perl code
- Contributing to CPAN
Just like Learning Perl, material in this book closely follows the popular introductory Perl course the authors have taught since 1991. This second edition covers recent changes to the language up to version 5.14.
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Perls object-oriented mechanism is classic prestidigitation. It takes a collection of Perls existing non-OO features such as packages, references, hashes, arrays, subroutines, and modules, and thenwith nothing up its sleevemanages to conjure up fully functional objects, classes, and methods. Seemingly out of nowhere.
Thats a great trick. It means you can build on your existing Perl knowledge and ease your way into OO Perl development, without first needing to conquer a mountain of new syntax or navigate an ocean of new techniques. It also means you can progressively fine-tune OO Perl to meet your own needs, by selecting from the existing constructs the one that best suits your task.
But theres a problem. Since Perl co-opts packages, references, hashes, arrays, subroutines, and modules as the basis of its OO mechanism, to use OO Perl you already need to understand packages, references, hashes, arrays, subroutines, and modules.
And theres the rub. The learning curve hasnt been eliminated; its merely been pushed back half a dozen steps.
So then: how are you going to learn everything you need to know about non-OO Perl so you can start to learn everything you need to know about OO Perl?
This book is the answer. In the following pages, Randal draws on two decades of using Perl, and four decades of watching Gilligans Island and Mr. Ed , to explain each of the components of Perl that collectively underpin its OO features. And, better still, he then goes on to show exactly how to combine those components to create useful classes and objects.
So if you still feel like Gilligan when it comes to Perls objects, references, and modules, this book is just what the Professor ordered.
And thats straight from the horses mouth.
Almost 20 years ago (nearly an eternity in Internet time), Randal Schwartz wrote the first edition of Learning Perl. In the intervening years, Perl itself has grown substantially from a cool scripting language used primarily by Unix system administrators to a robust object-oriented programming language that runs on practically every computing platform known to mankind, and maybe some that arent.
Throughout its six editions, Learning Perl remained about the same size, around 300 pages, and continued to cover much of the same material to remain compact and accessible to the beginning programmer. But there is much more to learn about Perl.
Randal called the first edition of this book Learning Perl Objects, References, and Modules, and we renamed its update Intermediate Perl, but we like to think of it as just Learning More Perl. This is the book that picks up where Learning Perl leaves off. We show how to use Perl to write larger programs.
As in Learning Perl, we designed each chapter to be small enough to read in just an hour or so. Each chapter ends with a series of exercises to help you practice what youve just learned, and the answers are provided in the appendix for your reference. And, like Learning Perl, weve developed the material in this book for use in a teaching environment.
Unless we note otherwise, everything in this book applies equally well to Perl on any platform, whether that is Unix, Linux, Windows ActivePerl from ActiveState, Strawberry Perl, or any other modern implementation of Perl. To use this book you just need to be comfortable with the material in Learning Perl and have the ambition to go further.
After you finish this book, you will have seen most of the core Perl language concepts that youll need. The next book in the series is Mastering Perl, which focuses on applying what you already know to writing effective and robust Perl applications as well as managing the Perl software development life cycle.
At any point in your Perl career, you should also have Programming Perl, the (mostly) definitive bible of the language.
There are three major sections of this book. The first section deals with references, which are the keys to complex data structures as well as to object-oriented programming. The second section introduces objects and how Perl implements object-oriented programming. The third and last section deals with Perls module structure, testing, and the community infrastructure for distributing our work.
You should read this book from front to back, stopping to do the exercises. Each chapter builds on preceding chapters, and well assume that you know the material from those chapters as we show new topics.
An introduction to the material.
, Using ModulesUse Perls core modules as well as modules from other people. Were going to show you how to create your own modules later in the book, but until we do you can still use modules you already have.
, Intermediate FoundationsPick up some intermediate Perl skills youll need for the rest of the book.
, Introduction to ReferencesIntroduce a level of redirection to allow the same code to operate on different sets of data.
, References and ScopingLearn how Perl manages to keep track of pointers to data, and read an introduction to anonymous data structures and autovivification.
, Manipulating Complex Data StructuresCreate, access, and print arbitrarily deep and nested data structures including arrays of arrays and hashes of hashes.
, Subroutine ReferencesCapture behavior as an anonymous subroutine that you create dynamically and execute later.
, Filehandle ReferencesStore filehandles in scalar variables that you can easily pass around your program or store in data structures.
, Regular Expression ReferencesCompile regular expressions without immediately applying them, and use them as building blocks for larger patterns.
, Practical Reference TricksSorting complex operations, the Schwartzian Transform , and working with recursively defined data.
, Building Larger ProgramsBuild larger programs by separating code into separate files and namespaces.
, Creating Your Own Perl DistributionCreate a Perl distribution as your first step toward object-oriented programming.
, Introduction to ObjectsWork with classes, method calls, inheritance, and overriding.
, Introduction to TestingStart to test your modules so you find problems with the code as you create it.
, Objects with DataAdd per instance data, including constructors, getters, and setters.
, Some Advanced Object TopicsUse multiple inheritance, automatic methods, and references to filehandles.
, ExporterHow use works, how we can decide what to export, and how we can create our own import routines.
Add behavior to an object that is going away, including object persistence.
, Introduction to MooseMoose is an object framework available on CPAN.
, Advanced TestingTest complex aspects of code and metacode things such as documentation and test coverage.
, Contributing to CPANShare your work with the world by uploading it to CPAN.
, Exercise AnswersWhere to go to get answers.
The following typographic conventions are used in this book:
Constant widthUsed for function names, module names, filenames, environment variables, code snippets, and other literal text
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