object_in_ruby.md

Objects in ruby

An Object is an instance of a class, that is an object is something that exist in real world on the other hand a Class is an idea or a blueprint that describes some properties and behaviour. Ruby is a pure object oriented programming language - everything is an object.

Creating a new object

class lazzyPuppy
  def initialize(name)
    @name = name
  end
  
  def fetch(something)
    puts "I am sleepy woof! get the #{something} yourself."
  end
end
candy =  lazzyPuppy.new('candy')
candy.fetch('frisbee') # => I am sleepy woof! get the frisbee yourself.

Here lazzyPuppy is class it has name as a property and fetch as a behaviour. candy our lazy doggy is the real life (instance) of the lazzyPuppy class.

Now coming back to the question - How is ruby a pure object-oriented language. Take a look at this example -

2.even? # => true

3.times do
  puts "*"  # => Prints '*' in three lines
end

-1.positive? # => false

As you can see above we called methods on numbers i.e on 2, 3, 1 This implies 1, 2, 3.. are objects and are capable of responding to methods. This proves our point that everything in ruby is an object. In Java and other OOPs languages 1, 2, 3 are treated as literals and they don't directly support method calls.

As of ruby 2.4 - 1, 2 .. are objects of Integer class.