By Dave Thomas, Chad Fowler, Andy Hunt
Ruby is the quickest transforming into and most enjoyable dynamic language in the market. if you would like to get operating courses introduced quickly, you have to upload Ruby for your toolbox.
This ebook is the one whole reference for either Ruby 1.9 and Ruby 2.0, the very newest model of Ruby.
2013 marks the twentieth anniversary of the Ruby language. We're proud that all through its background, we've persisted to hide the most recent model of Ruby.
do you want to head from first concept to operating code a lot, a lot speedier? Do you presently spend extra time fulfilling the compiler rather than your consumers or finish clients? Are you pissed off with difficult languages that appear to get on your manner, rather than getting the paintings performed? Are you utilizing Rails, and wish to dig deeper into the underlying Ruby language? if that is so, then we've acquired a language and booklet for you!
Ruby is an absolutely object-oriented language, very like the vintage object-oriented language, Smalltalk. Like Smalltalk, it truly is dynamically typed (as against Java or C++), yet in contrast to Smalltalk, Ruby good points an analogous conveniences present in sleek scripting languages corresponding to Perl and Python.
the combo of the facility of a natural object-oriented language with the benefit of a scripting language makes Ruby a favourite instrument of clever, forward-thinking programmers.
The Pickaxe comprises 4 significant sections:
An acclaimed instructional on utilizing Ruby. The definitive connection with the language. entire documentation of all integrated sessions, modules, and strategies. entire descriptions of all ninety seven general libraries.
this is often the reference guide for Ruby, together with an outline of all of the normal library modules, an entire connection with all integrated periods and modules (including the entire new and altered equipment brought by means of Ruby 1.9, 1.9.2, 1.9.3, and 2.0). additionally it is all of the new and altered syntax and semantics brought for the reason that Ruby 1.8. find out about the recent parameter passing principles, neighborhood variable scoping in blocks, fibers, and the hot block assertion syntax, between different fascinating new features.
About Ruby 2.0
Ruby 2.0 is a minor replace to Ruby 1.9, in contrast to the extra significant updates from Ruby 1.8 to Ruby 1.9.
the foremost language adjustments in Ruby 2.0 are the addition of key-phrase arguments and the switch to take advantage of UTF-8 because the default resource dossier encoding.
there are various additions to the traditional library, including:
@Enumerator::Lazy@, which provides help for lazy entry to almost certainly countless lists. Refinements let you encapsulate adjustments to third-party sessions, and scope their program to person resource documents, fighting your alterations from polluting the worldwide application.
You'll additionally locate that Ruby 2 is quicker, and has reminiscence administration advancements that make it extra server-friendly.
All informed, there are over a hundred and ten sections of the publication which were flagged and cross-linked to point 2.0 content.
What You Need
This ebook assumes you could have a uncomplicated knowing of object-oriented programming.
in most cases, Ruby programmers are likely to want the the command line for operating their code, they usually are likely to use textual content editors instead of IDEs.
* Ruby runs on home windows, Linux, and Macs.
Read Online or Download Programming Ruby 1.9 & 2.0: The Pragmatic Programmers' Guide (4th Edition) PDF
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Extra resources for Programming Ruby 1.9 & 2.0: The Pragmatic Programmers' Guide (4th Edition)
10 Onward and Upward That’s it. We’ve finished our lightning-fast tour of some of the basic features of Ruby. We took a look at objects, methods, strings, containers, and regular expressions; saw some simple control structures; and looked at some rather nifty iterators. We hope this chapter has given you enough ammunition to be able to attack the rest of this book. It’s time to move on and move up—up to a higher level. Next, we’ll be looking at classes and objects, things that are at the same time both the highest-level constructs in Ruby and the essential underpinnings of the entire language.
You’ll normally define methods that let you access and manipulate the state of an object, allowing the outside world to interact with the object. These externally visible facets of an object are called its attributes. For our BookInStock objects, the first thing we may need is the ability to find out the ISBN and price (so we can count each distinct book and perform price calculations). One way of doing that is to write accessor methods: class BookInStock def initialize(isbn, price) @isbn = isbn @price = Float(price) end def isbn @isbn end Download from Wow!
Here’s a personal take. When you design a class, you decide what internal state it has and also decide how that state is to appear on the outside (to users of your class). The internal state is held in instance variables. The external state is exposed through methods we’re calling attributes. And the other actions your class can perform are just regular methods. It really isn’t a crucially important distinction, but by calling the external state of an object its attributes, you’re helping clue people in to how they should view the class you’ve written.