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The opposite of the private keyword is public. You could put private before one method, but then revert back to public methods again afterwards using public, like so: class Person def anyone_can_access_this ... end private def this_is_private ... end public def another_public_method ... end end You can also use private as a command by passing in symbols representing the methods you want to keep private, like so: class Person def anyone_can_access_this; ...; end def this_is_private; ...; end def this_is_also_private; ...; end def another_public_method; ...; end private :this_is_private, :this_is_also_private end
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Note Ruby supports ending lines of code with semicolons (;) and allows you to put multiple lines of code onto a single line (for example, x = 10; x += 1; puts x). In this case, it s been done to save on lines of code in the example, although it s not considered good style in production-quality Ruby code.
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The command tells Ruby that this_is_private and this_is_also_private are to be made into private methods. Whether you choose to use private as a directive before methods or as a command specifying the method names directly is up to you, and is another of many technically unimportant stylistic decisions you ll make as a Ruby programmer. However, it s
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important to note that in the preceding example the private declaration has to come after the methods are defined. Ruby supports a third form of encapsulation (other than public and private) called protected that makes a method private, but within the scope of a class rather than within a single object. For example, you were unable to directly call a private method outside the scope of that object and its methods. However, you can call a protected method from the scope of the methods of any object that s a member of the same class: class Person def initialize(age) @age = age end def age @age end def age_difference_with(other_person) (self.age - other_person.age).abs end protected :age end fred = Person.new(34) chris = Person.new(25) puts chris.age_difference_with(fred) puts chris.age
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9 :20: protected method 'age' called for #<Person:0x1e5f28 @age=25> (NoMethodError) The preceding example uses a protected method so that the age method cannot be used directly, except within any method belonging to an object of the Person class. However, if age were made private, the preceding example would fail because other_person.age would be invalid. That s because private makes methods accessible only by methods of a specific object. Note that when you use age directly, on the last line, Ruby throws an exception.
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Polymorphism is the concept of writing code that can work with objects of multiple types and classes at once. For example, the + method works for adding numbers, joining strings, and adding arrays together. What + does depends entirely on what type of things you re adding together.
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Here s a Ruby interpretation of a common demonstration of polymorphism: class Animal attr_accessor :name def initialize(name) @name = name end end class Cat < Animal def talk "Meaow!" end end class Dog < Animal def talk "Woof!" end end animals = [Cat.new("Flossie"), Dog.new("Clive"), Cat.new("Max")] animals.each do |animal| puts animal.talk end
Meaow! Woof! Meaow! In this example, you define three classes: an Animal class, and Dog and Cat classes that inherit from Animal. In the code at the bottom, you create an array of various animal objects: two Cat objects and a Dog object (whose names are all processed by the generic initialize method from the Animal class). Next, you iterate over each of the animals, and on each loop you place the animal object into the local variable, animal. Last, you run puts animal.talk for each animal in turn. As the talk method is defined on both the Cat and Dog class, but with different output, you get the correct output of two Meaow! s and two Woof! s. This demonstration shows how you can loop over and work upon objects of different classes, but get the expected results in each case if each class implements the same methods. If you were to create new classes under the Cat or Dog classes with inheritance (for example, class Labrador < Dog), then Labrador.new.talk would still return Woof! thanks to inheritance.
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