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Interacting Objects

Interacting Objects

Learn how objects interact with each other in Ruby.

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

Let’s see.

Here’s what we’d like to achieve:

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

We’d like this to print out the following for starters:

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">

Right, we need to define a method greet. Let’s do that:

Press + to interact
class Person
  # methods from above ...
  def initialize(name)
    @name = name
  end
  def name
    @name
  end
  
  #Now,
  def greet
  end
end
person = Person.new("Anja")
friend = Person.new("Carla")
person.greet(friend)

If we run this code, we’ll now get a new error message. Great, that’s progress:

ArgumentError: wrong number of arguments (1 for 0)
...

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