gistfile1.rb

pry(main)> edit dog.rb

# opens up vim where I add:
#
# class Dog
#   def bark
#     puts "Woof!"
#   end
# end

pry(main)> my_dog = Dog.new                                                                                                                                                                                                                                                                                               
=> #<Dog:0x007feb4b821f20>
pry(main)> my_dog.bark
Woof!
=> nil
pry(main)> edit dog.rb

# opens up vim and I change it to:
#
# class Dog
#   def initialize(bark)
#     @bark = bark
#   end
#
#   def bark
#     puts @bark
#   end
# end

[8] pry(main)> his_dog = Dog.new("Rufff!")
=> #<Dog:0x007feb4b21a8c0 @bark="Rufff!">
[9] pry(main)> his_dog.bark
Rufff!
=> nil
pry(main)> .ls | ack dog
dog.rb