instance_method.rb

# instance method
# An instance method is a method that is defined within a class and can be called on instances of that class. 
# It is used to perform actions or retrieve information specific to an instance of the class. 
# Instance methods can access and modify the instance variables/objects of the object they are called on.

class Guitar
  # This is instance variable
  def initialize
    @type = "Acoustic"
    @wood = "Alder"
    @strings = 6
  end

  # This is instance method
  def information
    puts "This guitar is a #{@type} guitar made of #{@wood} wood with #{@strings} strings."
  end

  def play
    puts "Strumming the #{@type} guitar!"
  end
end

# create instances of the Guitar class
guitar_1 = Guitar.new
guitar_2 = Guitar.new

# use instance method on the instances of the Guitar class
guitar_1.information
guitar_1.play

guitar_2.information
guitar_2.play