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Interacting Objects

Interacting Objects

Learn how objects can interact with each other by defining appropriate class methods .

Objects that interact

We’re now able to create our own objects. However, they don’t do a whole lot yet. Why not create two people, and let them greet each other?

Here’s what we’d like to achieve:

Press + to interact
Ruby
class Person
  def initialize(name)
    @name = name
  end
  def name
    @name
  end
end
person = Person.new("Anja")
friend = Person.new("Carla")
person.greet(friend)

If we run the code above, we get an error message that tells us that the greet method needs to be defined.

To begin, we’d like this method to print out the following:

Hi Carla!

If we run the code above, we’ll get an error message that tells us what to do next:

NoMethodError: undefined method `greet' for #<Person:0x007fbb5e9c88c8 @name="Anja">

We need to define a greet ...