Inheritance.rb

# I think the problem lies in class Charlie not being able to inherit the instance variables from class Guitar. 
#For example, when we run this code:


class Guitar 
  def initialize(brand, color)
  	@color = color
  	@brand = brand
  end
end

class Charlie < Guitar
  def initialize(brand)
  	@brand = brand
  end

  def play(arg)
  	"I'm playing my #@brand #@color guitar"
  end
end


g = Guitar.new("Gibson", "Blue")
c = Charlie.new(g)
p c
p c.play(g)


#the output is :
#<Charlie:0x007fc78c9ee0c0 @brand=#<Guitar:0x007fc78c9ee0e8 @color="Blue", @brand="Gibson">>
#"I'm playing my #<Guitar:0x007fc78c9ee0e8>  guitar"


#Class Charlie is not able to reach those instance variables because they are still bound to their instance of class Guitar. 
#However, if we change the instance variables to class variables, then class Charlie would be able to access those variables.

class Guitar 
  def initialize(brand, color)
  	@@color = color
  	@@brand = brand
  end
end

class Charlie < Guitar
  def initialize(brand)
  	@brand = brand
  end

  def play(arg)
  	"I'm playing my #@@brand #@@color guitar"
  end
end




g = Guitar.new("Gibson", "Blue")
c = Charlie.new(g)
p c
p c.play(g)

#Output: 
#<Charlie:0x007f9a0b1f6650 @brand=#<Guitar:0x007f9a0b1f6678>>
# "I'm playing my Gibson Blue guitar"


# However, using class variables are frowned upon in Ruby.