Null object pattern: Difference between revisions

Revision as of 14:20, 8 September 2019

Revision as of 11:09, 30 October 2019

Line 305:

In [[Duck typing|duck-typed]] languages like [[Ruby (programming language)|Ruby]], language inheritance is not necessary to provide expected behavior.

<source lang="ruby">

class Dog

def sound

"bark"

end

end

class NilAnimal

def sound(*); end

end

def get_animal(animal=NilAnimal.new)