PROXY FUNDAMENTALS

As mentioned in the chapter introduction, a proxy behaves as an abstraction for a target object. In many ways, it is analogous to a C++ pointer in that it can be wielded as a stand-in for the target object it points to but is, in fact, totally separate from the target object. The target object can either be manipulated directly or through the proxy, but manipulating directly will circumvent the behavior that a proxy enables.

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NOTE   There are key differences between ECMAScript proxies and C++ pointers that will be discussed later, but for introductory purposes pointers are a suitable conceptual building block.

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Creating a Passthrough Proxy

In its simplest form, a proxy can exist as nothing more than an abstracted target object. By default, all operations performed on a proxy object will be transparently propagated through to the target object. Therefore, you are able to use a proxy object in all the same ways and places that you would use the...