ES3.1 Object static methods rationale document

[Garrett Smith]

On Wed, Jul 16, 2008 at 1:16 PM, Allen Wirfs-Brock
<Allen.Wirfs-Brock at microsoft.com> wrote:
> -----Original Message-----
> From: Brendan Eich [mailto:brendan at mozilla.org]
>

> Right now, the best I can come up with is that it should be a relatively efficient way to test for the existence of a possibly inherited property.

The "in" operator tests for the existence of a possibly inherited property.

var hasProp = (p in o);


Garrett