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CHAPTER 6 FUNCTIONS AND ARRAYS
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Writing Object.defineProperties()
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Object.defineProperties() is sort of the plural version of Object.defineProperty(). That is to say, it can create or modify more than one member. Unlike Object.defineProperty(), this one takes two parameters. The first one is the same as Object.defineProperty() the object on which to add or modify members. The second one is an object containing one or more descriptor objects.
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So, for pre-ECMAScript 5 browsers, we ll loop through the descriptors parameter with a for in loop, disregarding descriptor members other than value: if (Object.defineProperty === undefined) { Object.defineProperty = function (obj, name, descriptor) { obj[name] = descriptor.value; }; } if (Object.defineProperties === undefined) { Object.defineProperties = function (obj, descriptors) { for (descriptor in descriptors) { if (descriptors.hasOwnProperty(descriptor)) { obj[descriptor] = descriptors[descriptor].value; } } }; } if (Object.create === undefined) { Object.create = function () { }; }
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Writing Object.create()
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Finally, Object.create() works with two parameters (recall we discussed create() in 5). The first one is the object to inherit members from. The optional second one is an object containing descriptors of its own members to add to the child object.
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For pre-ECMAScript 5 browsers, we ll write a function similar to clone() in 5. In the event that the optional descriptors parameter is defined, we ll pass those to Object.defineProperties(): if (Object.defineProperty === undefined) { Object.defineProperty = function (obj, name, descriptor) { obj[name] = descriptor.value; }; } if (Object.defineProperties === undefined) { Object.defineProperties = function (obj, descriptors) { for (descriptor in descriptors) { if (descriptors.hasOwnProperty(descriptor)) {
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CHAPTER 6 FUNCTIONS AND ARRAYS
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obj[descriptor] = descriptors[descriptor].value; } } }; } if (Object.create === undefined) { Object.create = function (parent, descriptors) { var Proxy = function () {}, child; Proxy.prototype = parent; child = new Proxy(); if (descriptors !== undefined) { Object.defineProperties(child, descriptors); } return child; }; }
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Now let s invoke toString() on Object.defineProperty, Object.defineProperties, and Object.create and then pass the string to Firebug s console.log() method. If you re running Firefox 3, JavaScript will print our pre-ECMAScript 5 functions in the left panel of Firebug, as in Figure 6 1. On the other hand, if you re running Firefox 4, JavaScript will print the native ECMAScript 5. Note that native functions are written in a compiled language like C++, so rather than print compiled gobbledygook for the body of a native function, JavaScript simply prints [native code]: if (Object.defineProperty === undefined) { Object.defineProperty = function (obj, name, descriptor) { obj[name] = descriptor.value; }; } if (Object.defineProperties === undefined) { Object.defineProperties = function (obj, descriptors) { for (descriptor in descriptors) { if (descriptors.hasOwnProperty(descriptor)) { obj[descriptor] = descriptors[descriptor].value; } } }; } if (Object.create === undefined) { Object.create = function (parent, descriptors) { var Proxy = function () {}, child; Proxy.prototype = parent; child = new Proxy(); if (descriptors !== undefined) { Object.defineProperties(child, descriptors); } return child; };
CHAPTER 6 FUNCTIONS AND ARRAYS
} console.log(Object.defineProperty.toString()); console.log(Object.defineProperties.toString()); console.log(Object.create.toString());
Figure 6 1. Firefox 3 opts for our pre-ECMAScript 5 functions. Now with those conditional advance loaders written, we can rework extend() from 5 so that the constructor members we add to the child and parent prototype objects are not enumerated in a for in loop. That is to say, our constructor members will behave like the native ones that get overwritten during prototype chaining or prototype replacement. Moreover, we ll set writable to true and configurable to false so that the constructor member can be changed but not deleted. Finally, we ll make the child constructor s superclass member writable and configurable but not enumerable. In this way, we retain the option to have the child not inherit from a parent. if (Object.defineProperty === undefined) { Object.defineProperty = function (obj, name, descriptor) { obj[name] = descriptor.value; }; } if (Object.defineProperties === undefined) { Object.defineProperties = function (obj, descriptors) { for (descriptor in descriptors) { if (descriptors.hasOwnProperty(descriptor)) { obj[descriptor] = descriptors[descriptor].value; } }
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