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Some of Ruby s built-in standard classes (such as Array, Hash, String, and so on) have polymorphic methods of their own. For example, you can call the to_s method on many builtin classes to return the contents of the object as a string: puts 1000.to_s puts [1,2,3].to_s puts ({ :name => 'Fred', :age => 10 }).to_s
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1000 123 age10nameFred The output isn t particularly useful in this case, but being able to rely on most objects to return a string with to_s can come in useful in many situations, such as when putting representations of objects into strings or when normalizing many types of object to strings that can then be compared or used in logical expressions.
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In Ruby, it s possible to define classes within other classes. These are called nested classes. Nested classes are useful when a class depends on other classes, but those classes aren t necessarily useful anywhere else. They can also be useful when you want to separate classes into groups of classes rather than keep them all distinct. Here s an example: class Drawing class Line end class Circle end end Nested classes are defined in the same way as usual. However, they re used differently. From within Drawing, you can access the Line and Circle classes directly, but from outside the Drawing class, you can only access Line and Circle as Drawing::Line and Drawing::Circle. For example: class Drawing def Drawing.give_me_a_circle Circle.new end class Line end class Circle def what_am_i "This is a circle"
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end end end a = Drawing.give_me_a_circle puts a.what_am_i a = Drawing::Circle.new puts a.what_am_i a = Circle.new puts a.what_am_i
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This is a circle This is a circle NameError: uninitialized constant Circle a = Drawing.give_me_a_circle calls the give_me_a_circle class method, which returns a new instance of Drawing::Circle. Next, a = Drawing::Circle.new gets a new instance of Drawing::Circle directly, which also works. The third attempt, a = Circle.new, does not work, however, because Circle doesn t exist. That s because as a nested class under Drawing, it s known as Drawing::Circle instead. You re going to use nested classes in a project at the end of this chapter, where you ll see how they work in the scope of an entire program.
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The Scope of Constants
In 3 you looked at constants: special variables whose value(s) are unchanging and permanent throughout an application, such as Pi = 3.141592. Here s an example: def circumference_of_circle(radius) 2 * Pi * radius end Pi = 3.141592 puts circumference_of_circle(10)
62.83184 In this sense, a constant appears to work like a global variable, but it s not. Constants are defined within the scope of the current class and are made available to all child classes, unless they re overridden. For example: Pi = 3.141592 class OtherPlanet Pi = 4.5
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def OtherPlanet.circumference_of_circle(radius) radius * 2 * Pi end end puts OtherPlanet.circumference_of_circle(10)
puts OtherPlanet::Pi
puts Pi
3.141592 This example demonstrates that constants have scope within the context of classes. The OtherPlanet class has its own definition of Pi. However, if you hadn t redefined it there, the original Pi would have been available to OtherPlanet, as the OtherPlanet class is defined within the global scope. The second section of the preceding example also demonstrates that you can interrogate constants within other classes directly. OtherPlanet::Pi refers directly to the Pi constant within OtherPlanet.
Modules, Namespaces, and Mix-Ins
Modules provide a structure to collect Ruby classes, methods, and constants into a single, separately named and defined unit. This is useful so you can avoid clashes with existing classes, methods, and constants, and also so that you can add (mix in) the functionality of modules into your classes. First, we ll look at how to use modules to create namespaces to avoid name-related clashes.
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