Function keyOf

docs/lib/react.js:19024–19033

(oneKeyObj)

 * reuse those resolutions.
 */
var keyOf = function (oneKeyObj) {
  var key;
  for (key in oneKeyObj) {
    if (!oneKeyObj.hasOwnProperty(key)) {
      continue;
    }
    return key;
  }
  return null;
};

module.exports = keyOf;
},{}],161:[function(_dereq_,module,exports){