Using ES6 Proxies for polymorphic functions
ES6 introduces Proxy Objects to define and augment objects behavior. Proxy objects can be used for property validation, object access control, object virtualization and more. Proxies already implemented in Firefox, Edge and coming to Chrome 49. Proxies can be used to implement polymorphic functions (multimethods). The exact function implementation is picked at runtime based on a special argument (
harmony:direct_proxies [ES Wiki]
This Proxy API replaces the earlier proxies API. A summary of the major differences between this API and the previous API can be found on the old strawman page. To construct a proxy that wraps a given target object: var proxy = Proxy(target, handler); Both target and handler must be proper Objects. It is not necessary to use new to create new proxy objects. The handler is an object that may implem
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Introducing ES2015 proxies  | Blog  | Chrome for Developers
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