What are interfaces in Ruby?

What are interfaces in Ruby?

In Ruby, interfaces are not explicitly defined like in some other languages. Instead, Ruby uses duck typing, which means that if an object responds to the methods defined in an interface, it can be treated as that interface.

Can you give me an example of how to implement an interface in Ruby?

Sure! You can create a module that defines the methods you want, and then include that module in your classes. For example:

module Drawable
  def draw
    raise NotImplementedError, 'You must implement the draw method'
  end
end

class Circle
  include Drawable
  def draw
    puts 'Drawing a circle'
  end
end

class Square
  include Drawable
  def draw
    puts 'Drawing a square'
  end
end

This way, both Circle and Square implement the draw method.

What happens if a class doesn't implement the interface methods?

If a class includes a module that defines methods but doesn't implement them, calling those methods will raise a NotImplementedError. This is a way to enforce that certain methods must be defined in the class.

Are there any best practices for using interfaces in Ruby?

Yes! It's best to keep your interfaces simple and focused, use meaningful method names, and document the expected behavior of the methods. Also, consider using tests to ensure that your classes implement the required methods.