New PDF release: Programming Ruby : the pragmatic programmers' guide

By Dave Thomas

Книга содержит исчерпывающую информацию по языку программирования Ruby.
С помощью этой книги можно начать изучение Ruby нуля. Рассматриваются вопросы установки Ruby синтаксиса классов, объектов философии разработки приложения на Ruby многие другие.
Рекомендую книгу также поклонникам популярного фреймворка «Ruby On Rails».

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Prepared exclusively for Yeganefar B LOCKS AND I TERATORS 19 Blocks and Iterators This section briefly describes one of Ruby’s particular strengths. We’re about to look at code blocks: chunks of code you can associate with method invocations, almost as if they were parameters. This is an incredibly powerful feature. ” We’d have to agree. You can use code blocks to implement callbacks (but they’re simpler than Java’s anonymous inner classes), to pass around chunks of code (but they’re more flexible than C’s function pointers), and to implement iterators.

In Ruby, that’s not the case; nil is an object, just like any other, that happens to represent nothing. Anyway, back to arrays and hashes. 1. Example variable and class names Local Variables Global Instance Class Constants and Class Names name fish_and_chips x_axis thx1138 _26 $debug $CUSTOMER $_ $plan9 $Global @@total @@symtab @@N @@x_pos @@SINGLE PI FeetPerMile String MyClass JazzSong @name @point_1 @X @_ @plan9 Sometimes creating arrays of words can be a pain, what with all the quotes and commas.

The trick here is the Ruby keyword super. When you invoke super with no arguments, Ruby sends a message to the parent of the current object, asking it to invoke a method of the same name as the method invoking super. It passes this method the parameters that were passed to the originally invoked method. Now we can implement our new and improved to_s. class KaraokeSong < Song # Format ourselves as a string by appending # our lyrics to our parent's #to_s value. ]" We explicitly told Ruby that KaraokeSong was a subclass of Song, but we didn’t specify a parent class for Song itself.

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