When a property is first added to an object, JavaScript uses an inter- nal method called using Object defineProperty() even if the property doesn't already exist
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1 8 in 2008 □ JavaScript 1 8 5 in 2010, ECMA Script 5 compliance Object defineProperty() allows basic AOP □ Get and set access can be monitored □
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A Javascript object is a map of strings -> values + a prototype pointer • Just a first Object defineProperty(point, 'x', { value: 1, writable: false, enumerable: false,
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Learned a lot about JavaScript Javascript engines implement the ECMAScript Object defineProperty(Array prototype, “0”, {get : func, set : func}); var a = [];
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When a property is first added to an object, JavaScript uses an inter- nal method called using Object defineProperty() even if the property doesn't already exist
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defineProperties(Constructor, staticProps); return Constructor; }; })();var _get = function get(object, property, receiver) { if (object === null) object
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An Object ECMAScript 3 Object Model An Object A Function (closure) Object defineProperty(Array prototype, "forEach", { enumerable: false, writable:false, configurable: JSON2 reference implementation (http://www json org/json2 js)
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