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PORuby Classes within Classes (or Modules within Modules)
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2013-02-06T21:59:27.987
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As I'm reading different Ruby books, I've noticed that Ruby classes can be defined within other Ruby classes or modules. Here's an example of a class within a class: <pre><code>class Outerclass def foobar puts "FOOBAR" end class Innerclass def barfoo puts "BARFOO" end end end </code></pre> Here's some code that I ran in IRB to try to understand this conceptually: <pre><code>oc = Outerclass.new # => #<Outerclass:0x00000100a46478> Outerclass.instance_methods(false) # => [:foobar] ic = Outerclass::Innerclass.new # => #<Outerclass::Innerclass:0x00000100a0b120> ic = Outerclass::Innerclass.instance_methods(false) # => [:barfoo] </code></pre> Here are my questions: <ol> <li>When the ruby interpreter first encounters my Class definition code above, does it go through the methods I've written and store it somewhere? I know that the instance method "foobar" doesn't actually get run since there's no call being made to it within the Outerclass definition.</li> <li>Piggybacking off the 1st question, what about when Ruby encounters the class Innerclass? What happens here?</li> <li>In general, what are some reasons why you would want to have classes within classes? Are there any advantages to doing this?</li> <li>Does an instance of Outerclass know anything about the class Innerclass?</li> <li>Does an instance of Innerclass know anything about the class Outerclass?</li> </ol> Appreciate any help you can provide!
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Ruby Classes within Classes (or Modules within Modules)
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