propertyOptimize-3.js

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// Properties cleared in the middle of a single function constructor.

function foo(x, y) {

  this.f = 0;

  this.g = x + y;

  this.h = 2;

var called = false;

var a = 0;

var b = {valueOf: function() { Object.defineProperty(Object.prototype, 'g', {set: function() { called = true }}) }};

var c = new foo(a, b);

assertEq(called, true);

assertEq(c.g, undefined);

// Properties cleared in the middle of a constructor callee.

function foo2(x, y) {

  this.a = 0;

  this.b = 1;

  bar2.call(this, x, y);

  this.c = 2;

function bar2(x, y) {

  this.d = x + y;

  this.e = 3;

var called2 = false;

var xa = 0;

var xb = {valueOf: function() { Object.defineProperty(Object.prototype, 'e', {set: function() { called2 = true }}) }};

var xc = new foo2(xa, xb);

assertEq(called2, true);

assertEq(xc.e, undefined);

assertEq(xc.c, 2);

// Properties cleared after a constructor callee.

function foo3() {

  this.aa = 0;

  this.bb = 1;

  bar3.call(this);

  this.cc = 2;

  baz();

  xbar3.call(this);

  this.dd = 3;

function bar3() {

  this.ee = 4;

function xbar3() {

  this.ff = 5;

function baz() {

  eval("xbar3.call = function() { called3 = true }");

var called3 = false;

var c3 = new foo3();

assertEq(c3.cc, 2);

assertEq(c3.ee, 4);

assertEq(c3.ff, undefined);

assertEq(c3.dd, 3);

assertEq(called3, true);