gistfile1.md

class Point  
    attr_accessor :x
    attr_accessor :y

    def initialize(*args)       
        init_methd_name = "_init_#{args.size}"      
        send(init_methd_name, *args)        
    end

protected
    def _init_1(coordinates)
        _init_2(coordinates[:x], coordinates[:y])
    end

    def _init_2(x, y)
        raise "Error..." if (x < 0 || y < 0)          
        @x = x
        @y = y
    end
end