sidef/scripts/RosettaCode/polymorphism.sf

#!/usr/bin/ruby

#
## https://rosettacode.org/wiki/Polymorphism
#

class Point(x=0, y=0) {

}

class Circle(x=0, y=0, r=0) {

}

func pp(Point obj) {
    say "Point at #{obj.x},#{obj.y}";
}

func pp(Circle obj) {
    say "Circle at #{obj.x},#{obj.y} with radius #{obj.r}";
}


pp(Point.new);              # => Point at 0,0
var p = Point.new(1, 2);    # create a point
pp(p);                      # => Point at 1,2
say p.x;                    # => 1
p.y += 1;                   # add one to y
pp(p);                      # => Point at 1,3

var c = Circle.new(4,5,6);  # create a circle
var d = c.clone;            # clone it
d.r = 7.5;                  # and change the radius to 7.5
pp(c);                      # => Circle at 4,5 with radius 6
pp(d);                      # => Circle at 4,5 with radius 7.5