Mastering JavaScript Promises

Promise as a proxy

One marvelous thing about a promise that distinguishes it from the rest is that it can act as a proxy for another object, not only for local objects but also for a remote object. There are methods that let you confidently employ properties or call functions. All of these exchanges return promises, so that they can be chained.

Here is list of functions you can use as proxies of a promise:

Direct manipulation	Using a promise as a proxy
value.foo	promise.get("foo")
value.foo = value	promise.put("foo", value)
delete value.foo	promise.del("foo")
value.foo(...args)	promise.post("foo", [args])
value.foo(...args)	promise.invoke("foo", ...args)
value(...args)	promise.fapply([args])
value(...args) ...