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Self-hosted javascript editor using `for ... in`?

I am thinking of one thing, since for(var i in obj) can pretty much enumerate anything inside a DOM or javascript object, so are there any selfhosted javascript editor that use for ... in to offer grammar auto-suggest, discover class property/methods, external API?

Edit1: Thanks guys for the grammar suggestion and non-enumerable functions, but what I looking for is an editor based on this idea.

Solution

  • Because some of the members would be non-enumerable, you'd have to use Object.getOwnPropertyNames, and even walk the prototype chain a bit (using Object.getPrototypeOf). Here's what I mean:

    >>> Object.getOwnPropertyNames([]);
["length"]

>>> Object.getOwnPropertyNames(Array.prototype);
["length", "constructor", "toSource", "toString", "toLocaleString", ...]