Ruby: Use class methods to reduce duplication

Context: I had two method definitions in my class that were similar to the code below.

class TaxRemoteFacade

  def state_tax
    ...
    @remote.close
  end

  def federal_tax
    ...
    @remote.close
  end

end

I've only shown two, but we actually needed the @remote.close code at the end of several methods.

Solution: To reduce the duplication you could introduce a mixin with a method to remove the duplication.

module RemoteFacade
  def remote_call(method_name, &block)
    class_eval do
      define_method name do
        instance_eval &block
        @remote.close
      end
    end
  end
end

The TaxRemoteFacade can now be defined as the code below.

class TaxRemoteFacade
  extend RemoteFacade

  remote_call do :state_tax do
    ...
  end

  remote_call do :federal_tax do
    ...
  end

end