coffee-script style constructor for ruby (for automatic instance variable setting)

initialize.rb

class Class
  def initialize(*vars)
    keys = vars.map{ |k| k.to_s.sub(/^@/, '')}
    define_method :initialize do |args|
      args.each_pair do |k,v|
        raise ArgumentError, "Unexpected argument #{k}" unless keys.include?(k.to_s)
        instance_variable_set "@#{k}", v
      end
    end
  end
end

class Tile
  initialize :@location, :@area
end

Tile.new location: "1,3", area: "24sqft."

What about default values, and a block to allow you to write additional code in the initialize method?

class Tile
  initialize :@location, :@area, @:color => "white" do
    # other things to do initialize
  end
end