44. function f() {};
f.prototype.x = 3; z: 0 P2 f P x: 3
var a = new f;
a.x = 2;
a.y = 1; a b
var b = new f; x: 2
f.prototype = {z: 0}; y: 1
45. function f() {};
f.prototype.x = 3; z: 0 P2 f P x: 3
var a = new f;
a.x = 2;
a.y = 1; c a b
var b = new f; x: 2
f.prototype = {z: 0}; y: 1
var c = new f;
46. function f() {};
f.prototype.x = 3; z: 0 P2 f P x: 3
var a = new f;
a.x = 2;
a.y = 1; c a b
var b = new f; x: 2
f.prototype = {z: 0}; y: 1
var c = new f;
b.constructor == f
c.constructor == Object