michael@0: function test1() {
michael@0:     var dense = [1, 2, 3];
michael@0:     var denseHoles = [1, , 3];
michael@0:     var result = 0;
michael@0: 
michael@0:     for (var i = 0; i < 70; i++) {
michael@0:         if (i in dense) result += 1;
michael@0:         if (1 in dense) result += 2;
michael@0:         if (3 in dense) result += 3;
michael@0:         if (-1000 in dense) result += 4;
michael@0:         if (i in denseHoles) result += 5;
michael@0:         if (1 in denseHoles) result += 6;
michael@0:     }
michael@0: 
michael@0:     assertEq(result, 153);
michael@0: }
michael@0: test1();
michael@0: 
michael@0: function test2() {
michael@0:     var a = [1, 2, 3];
michael@0: 
michael@0:     for (var i = 0; i < 70; i++) {
michael@0:         assertEq(-0 in a, true);
michael@0:         assertEq(Math.sqrt(4) in a, true);
michael@0:         assertEq(1.9 in a, false);
michael@0:         assertEq(NaN in a, false);
michael@0:         assertEq(Infinity in a, false);
michael@0:     }
michael@0: }
michael@0: test2();
michael@0: 
michael@0: function test3() {
michael@0:     var a = [1, , 3];
michael@0: 
michael@0:     for (var i = 0; i < 70; i++) {
michael@0:         if (i == 60)
michael@0:             Object.prototype[1] = null;
michael@0:         assertEq(1 in a, i >= 60);
michael@0:     }
michael@0: }
michael@0: test3();