Ruby On Rails perguntas e respostas de entrevista
Question: How can you achieve the same as Multiple Inheritance using Ruby? What is Mixin?Answer:Ruby offers a very neat alternative concept called mixin. Modules can be imported inside other class using mixin. They are then mixed-in with the class in which they are imported. Heres an example: module Debug
def whoAmI?
"I am #{self.to_s}"
end
end
class Photo
include Debug
end
ph = Photo.new
"I am : #<Photo:0x007f8ea218b270>"As you can see above the class Debug and its method whoamI? were mixed-in (added) with the class Photo. Thats why you can now create an instance of the Photo class and call the whoAmI? method. ph.whoAmI? => "I am : #<Phonograph:0x007f8ea218b270>" |
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