Operation[params] vs Operation.(params) vs Operation(params)

operation.rb

# gem code

module Trailblazer
  class Operation

    def self.inherited(klass)
      qualified_name = klass.name
      name_parts = qualified_name.split('::')
      method_name = name_parts.last
      container_name = name_parts[0...-1].join('::')
      container = const_get(container_name)

      container.instance_eval <<-RUBY, __FILE__, __LINE__ + 1
        def self.#{method_name}(*args)
          #{qualified_name}.new().process(*args)
        end
      RUBY
    end

  end
end

# user code

class SomeModel
  class CreateUser < Trailblazer::Operation
    def process(params)
      # blah...
      puts "Processing with #{params.inspect}"
    end
  end
end

params = {:foo => :bar}

create_user = SomeModel.CreateUser(params)