perf: checking == null faster than hasOwnProperty

http://jsperf.com/hasownproperty-vs-in-vs-other/4

diff --git a/src/lib/moment/constructor.js b/src/lib/moment/constructor.js
index 1b3425f4ab6c5dbbacdf3ba47e1e8bbc5f0e479b..f7355939305926c0fa80f7f4c0efef71fbe20ef9 100644 (file)
--- a/src/lib/moment/constructor.js
+++ b/src/lib/moment/constructor.js
@@ -69,5 +69,5 @@ export function Moment(config) {
 }
 
 export function isMoment (obj) {
-    return obj instanceof Moment || (obj != null && hasOwnProp(obj, '_isAMomentObject'));
+    return obj instanceof Moment || (obj != null && obj._isAMomentObject != null);
 }