Comment #3 on issue 1800 by [email protected]: Wanted: Efficient way to
count the number of properties in an Object
http://code.google.com/p/v8/issues/detail?id=1800
To clarify my last comment... obviously `Object.keys(obj)` runs in linear
time, but if the user is only interested in `Object.keys(obj).length`,
rather than running `Object.keys(obj)` followed by the `.length`, just
optimizing the statement to get the number of keys in `obj`. Hopefully,
that makes more sense.
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