Create module variables in Ruby

Question

Is there any way to create a variable in a module in Ruby that would behave similar to a class variable? What I mean by this is that it would be able to be accessed without

Answer 1

If you do not need to call it from within an instance, you can simply use an instance variable within the module body.

module SomeModule
  module_function
  def param; @param end
  def param= v; @param = v end
end

SomeModule.param
# => nil
SomeModule.param = 1
SomeModule.param
# => 1

The instance variable @param will then belong to the module SomeModule, which is an instance of the Module class.