michael@0: 
michael@0: function Foo(x)
michael@0: {
michael@0:   this.f = x + 10;
michael@0: }
michael@0: 
michael@0: function Bar()
michael@0: {
michael@0:   this.g = 0;
michael@0: }
michael@0: 
michael@0: Bar.prototype = Foo.prototype;
michael@0: 
michael@0: var x = new Foo(0);
michael@0: var y = new Bar();
michael@0: 
michael@0: assertEq(10, eval("x.f"));
michael@0: assertEq(undefined, eval("y.f"));
michael@0: 
michael@0: function Other(x)
michael@0: {
michael@0:   this.f = x + 10;
michael@0: }
michael@0: 
michael@0: var a = new Other(0);
michael@0: var b = Object.create(Other.prototype);
michael@0: 
michael@0: assertEq(10, eval("a.f"));
michael@0: assertEq(undefined, eval("b.f"));