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yvesvanbroekhoven/ruby-singleton-inheritance.rb

Created February 21, 2013 15:19
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Ruby singleton & inheritance
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ruby-singleton-inheritance.rb
class Parent
def self.name(name)
@name = name
puts @name
end
def whoami
puts "I'm the parent #{@name}"
end
name('dad')
end
class Child < Parent
def self.name
super
end
end
@fd

fd commented Feb 21, 2013

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  • L4 zet een instance variable op het object Parent (self) dat nu toevallig ook een Class is.
  • L9 zal nooit 'dad' printen omdat dat word uitgevoerd op een object dat een Parent is.

Maw:

  • Parent.new.class => Parent
  • Parent.class => Class

@yvesvanbroekhoven

yvesvanbroekhoven commented Feb 21, 2013

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Author 
class Parent

  def self.name(name = nil)
    if name
      @name = name
    else
      @name
    end
  end

  def whoami
    puts "I'm #{self.class.name}"
  end

  name('dad')

end

class Child < Parent

  def self.name(name = nil)
    super
  end

  name('babydoll')
end

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