Object Oriented Programming
Inheritance in Ruby
Inheritance is used to inherit another class' members, including fields and methods. A sub class extends a super class' members.
class subClass < superClass #to access a super class method super(methodName) end
Instance variables are not inherited.
If a method is written in the subclass with the same name and parameters as one in the parent class, the super class' method is overwritten.
With class extension, when referring specifically to a super class member, use the keyword 'super'.
class Cat def initialize @name = "Garfield" end def sound #implemented sound method from interface return "Meow" end end class Tiger < Cat def initialize #will overwrite Cat constructor @name = "Mike Tyson Jr." end def sound #will overwrite the Cat sound method return "Roar" end def catSound super(sound) #will call cat's sound end end