naver/jindojs-jindo — pull request #1 by laziel (2014-12-23 15:11:45+00:00)
Title: $H.keys: use Object.keys if available

Change jindo.$H.prototype.keys() to use Object.keys() which is ECMA5 specified feature if available to use. The Object.keys() method returns an array of a given object's own enumerable properties, in the same order as that provided by a for...in loop.

Browser compatibility:
IE9+, Chrome5+, FF4+, Safari5+, Opera12+