Namespacing

Namespacing

A module can wrap classes to group related code and avoid name collisions, accessed with ::, like Shapes::Circle. This is especially useful in larger codebases or libraries where two unrelated classes might otherwise want the same short name. Namespacing with a module is purely organizational and adds no behavior of its own.

Note: Use :: to reach into a namespacing module, like Shapes::Circle.new, distinct from . which calls a method.

Example: Namespacing

module Shapes
  class Circle
    def initialize(radius)
      @radius = radius
    end

    def area
      3.14159 * @radius ** 2
    end
  end
end

circle = Shapes::Circle.new(3)
puts circle.area