Smart. These would be like the dict proposal [1]. It might make sense to encapsulate this, e.g. as a constructor StringMap. Rationale: allows you to use a shim on older systems. And you have to change existing code, anyway.
In the shim, one could avoid creating excess garbage by only prefixing keys ending with "__proto__". For "__proto__" itself, one could cache the prefixed key, for others having the suffix, one would only do so to make absolutely sure that keys never clash. [1] http://wiki.ecmascript.org/doku.php?id=strawman:dicts On Dec 29, 2011, at 2:39 , Mark S. Miller wrote: > The most surprising punchline is in requirement #4: > > Object.create(null), creating an object that does not inherit from > Object.prototype, also creates an object that does not inherit it’s > __proto__, even if that property has not been deleted. With this change, > objects-as-stringmaps for objects created by Object.create(null) would avoid > the __proto__ hazard, even in contexts where Object.prototype.__proto__ has > not been deleted. (FF already acts this way, so my previous message was wrong > in claiming that Object.create(null) fails to avoid this platform on all > non-IE browsers.) -- Dr. Axel Rauschmayer a...@rauschma.de home: rauschma.de twitter: twitter.com/rauschma blog: 2ality.com
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