Download e-book for iPad: Metaprogramming Ruby: Program Like the Ruby Pros by Paolo Perrotta

By Paolo Perrotta

Everyone within the Ruby international seems conversing approximately metaprogramming--how you should use it to take away duplication on your code and write based, appealing courses. you can now get in at the motion as well.

This booklet describes metaprogramming as an integral part of Ruby. when you comprehend the foundations of Ruby, together with the article version, scopes, and eigenclasses, you're in your solution to utilizing metaprogramming either on your day-by-day paintings and on your enjoyable, after-hours projects.

studying metaprogramming doesn't need to be tricky or uninteresting. via taking you on a Monday-through-Friday workweek experience with a couple of programmers, Paolo Perrotta is helping make getting to know the paintings of metaprogramming either elementary and entertaining.

The publication is packed with:

Pragmatic examples of metaprogramming in motion, lots of which come immediately from renowned libraries or frameworks, reminiscent of Rails. Programming demanding situations that allow you to test and play with one of the most enjoyable, "out-there" metaprogramming strategies. * Metaprogramming spells--34 useful recipes and idioms for you to research and observe immediately, to put in writing code that's absolute to impress.

no matter if you're a Ruby apprentice at the route to getting to know the language or a Ruby wiz looking for new advice, this ebook is for you.

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If you’re curious, you’ll have to find it yourself, maybe with some help from your friend irb. It’s almost time to go home after an exhausting, but very satisfying, day of work. But before you call it a day, Bill does a complete wrap-up of what you learned. 7 Object Model Wrap-Up Here’s a checklist of what you learned today: • An object is composed of a bunch of instance variables and a link to a class. • The methods of an object live in the object’s class (from the point of view of the class, they’re called instance methods).

At the second mention, class D already exists, so Ruby doesn’t need to define it. Instead, it just reopens the existing class and defines a method named y( ) there. In a sense, the class keyword in Ruby is more like a scope operator than a class declaration. Yes, it does create classes that don’t yet exist, but you might argue that it does this as a side effect. For class, the core 30 O PEN C LASSES job is to move you in the context of the class, where you can define methods. You might think that Bill is just nitpicking here, but this distinction about the class keyword is not an academic detail.

7: Method lookup with modules an object, you can call the Kernel methods from anywhere. This gives you the illusion that print is a language keyword, when it’s actually a method. 13 You can take advantage of this mechanism yourself: if you add a method to Kernel, this Kernel Method will be available to all objects. To prove this is actually useful, Bill shows you an example from one of Ruby’s most popular libraries. 13. If you’re not convinced that you’re always inside an object, wait for the sidebar on page 54.

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