| Object._ _proto_ _ Property |
Flash 5 |
| a reference to the object's constructor's prototype property |
read/write |
Description
The _ _proto_ _ property stores a reference to the
automatically-assigned prototype property of
someObject's constructor
function, which is used to transfer properties down through a class
hierarchy. An object's _ _proto_
_ property is mostly used internally by the interpreter to
look up inherited properties for an object, but we can also use it to
determine the class of an object, as shown in Example 12-5. Some developers also use _ _proto_
_ to establish inheritance between a subclass and its
superclass, as discussed in Section 12.7.3 in Chapter 12.
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Note that the _ _proto_ _ property is formed using
two underscore characters at its beginning and
another two underscore characters at its end.
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Usage
Overwriting an object's _ _proto_
_ property is not recommended, because it alters the
natural structure of class inheritance.
See Also
Function.prototype,
instanceof; Section 12.7.1
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