Proxy

Proxy - wrapping objects & intercept behaviors

Create Proxy

Without handler hooks, the proxy just transparently wrap around an object

new Proxy(someObject, {/* handler hooks */});

Proxy.reocable(someObject, { /* handler hooks */ }) creates a revocable Proxy:

• aRevocableProxy.proxy - a Proxy object created with new Proxy
• aRevocableProxy.revoke() - no argument function to switch off the proxy (and any further methods throw error)

Handler Hooks

handler.getPrototypeOf()

A trap for Object.getPrototypeOf.

handler.setPrototypeOf()

A trap for Object.setPrototypeOf.

handler.isExtensible()

A trap for Object.isExtensible.

handler.preventExtensions()

A trap for Object.preventExtensions.

handler.getOwnPropertyDescriptor()

A trap for Object.getOwnPropertyDescriptor.

handler.defineProperty()

A trap for Object.defineProperty.

handler.has()

A trap for the in operator.

handler.get()

A trap for getting property values.

handler.set()

A trap for setting property values.

handler.deleteProperty()

A trap for the delete operator.

handler.ownKeys()

A trap for Object.getOwnPropertyNames and Object.getOwnPropertySymbols.

handler.apply()

A trap for a function call.

handler.construct()

A trap for the new operator.