2015-11-02 23:34 GMT+01:00 Coroutines <[email protected]>: > > I come from Lua. In Lua we make proxy objects with metamethods. You > create an empty table/object and define a metatable with a __index and > __newindex to catch accesses and changes when a key/property doesn't > exist. I would primarily use this in sandboxes where I wanted to > track the exact series of operations a user was performing to modify > their environment (the one I'd stuck them in).
For this type of use case, you can use an ES6 Proxy < https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Proxy>. You can think of the proxy handler's methods as the 'metamethods' of the proxy object. What O.o would provide beyond Proxy is the ability to observe changes to already pre-existing objects. However, since you mention you'd start with an empty table/object, you should be able to create a fresh Proxy and use that to trace all property accesses. Proxies are particularly well-suited when you want to sandbox things, since you should be in control of the sandboxed environment anyway and can set-up proxies to intermediate. O.o is particularly well-suited to scenarios where there are already plenty of pre-existing objects and you don't know ahead of time which ones to observe and which not. Cheers, Tom
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