Polymorphism in Ruby
by Ahmad hamza (@ahmad_719)
What is Polymorphism?
What if 'CUT' is being said to these people?
The Surgeon
The Hair Stylist
The provision of a single interface to entities of different types
Inheritance
By inheritance we can achieve polymorphism
Duck Typing
When I see a bird that walks like a duck and swims like a duck and quacks like a duck, I call that bird a duck.
1.to_i #=> Fixnum
"1".to_i #=> Fixnum You should treat objects according to the methods they define,
rather than the classes from which they inherit or the modules they include.
Decorator Pattern
The decorator pattern is used to extend the functionality of a certain object in a runtime. In a statically typed language you need to define decorator interface, then subclass from it and initialize the component (object) that you are decorating.
Replace conditional statements
Subtitle
class Parser
def parse(type)
puts 'The Parser class received the parse method'
if type == :xml
puts 'An instance of the XmlParser class received the parse message'
elsif type == :json
puts 'An instance of the JsonParser class received the parse message'
end
end
end