Oriented Object Programming

Oriented Object Programming (OOP) is a programming paradigm based on the concept of objects.

As my main programming language is Ruby, it’s obviously the paradigm I’m the most familiar with : one of the biggest principle in Ruby is that “Everything is object”.

I like to see objects as abstraction of real world things, with their attributes and methods.

class Dog < Animals
	
	attr_accessor :race, :color
	
	def bark
		"Wouaf"
	end
	
end
 
dog = Dog.new
puts dog.bark
# => Wouaf
dog.race = "Rotweiller"
puts dog.race
# => Rotweiller

Here’s a basic Dog object with two attributes, that represent what a dog can be, and a method that represent what a dog can do.

This dog extend from the Animal object, which have his own set of attributes that represent what an animal can be, and a set of methods that represent what it can do.

class Animals
	
	attr_accessor :size
	
	def eat
		"Eating..."
	end
	
	def reproduce
		"Reproducing..."
	end
	
end
 
animal = Animal.new
puts animal.eat
# => Eating...

By extending objects, the childs can use the methods of parents. This keep a clean code and satisfy the first principle of SOLID which is the Single responsability principle

dog = Dog.new # From the class Dog
puts dog.eat # Using the method from Animal class on Dog
# => "Eating..."