New syntax for calling Class objects in Ruby

ruby_call_class.rb

# encoding: utf-8
class Greeter
  def self.call(language)
    new(language)
  end

  def initialize(language)
    @language = language
  end

  def day
    case @language
    when "en" then "Hey"
    when "fr" then "Bonjour"
    when "es" then "Buenos días"
    end
  end

  def evening
    case @language
    when "en" then "Good evening"
    when "fr" then "Bonsoir"
    when "es" then "Buenas tardes"
    end
  end
end

# Greeter.("fr").evening
# Greeter.("es").day