examples/closure_oop.av

## examples/closure_oop.av

## a function to return a rectangle instance.
fn rectangle(x, y) {
  let r = seq.map("x", x, "y", y);

  r.area = lambda() ->
    return r.x * r.y;
  end;
  r.circum = lambda() ->
    return 2 * (r.x + r.y);
  end;

  return r;
}

let s1 = rectangle(3, 4);

println("s1 info:");
println("s1.x: #{s1.x}");
println("s1.y: #{s1.y}");
println("s1 area: #{s1.area()}");
println("s1 circum: #{s1.circum()}");
p();

let s2 = rectangle(9, 10);

println("s2 info:");
println("s2.x: #{s2.x}");
println("s2.y: #{s2.y}");
println("s2 area: #{s2.area()}");
println("s2 circum: #{s2.circum()}");
p();

s2.x = 100;
s2.y = 200;
println("s2 info after setting:");
println("s2.x: #{s2.x}");
println("s2.y: #{s2.y}");
println("s2 area: #{s2.area()}");
println("s2 circum: #{s2.circum()}");