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function testClosures() { function MyObject(id) { var thisObject = this; this.id = id; this.toString = str; function str() { return "" + this.id + thisObject.id; } } var a = []; for (var i = 0; i < 5; i++) a.push(new MyObject(i)); return a.toString(); } assertEq(testClosures(), "00,11,22,33,44");