matchesSelector optimize

Author: Murad Rogozhnikov

lib/draggable.js

@@ -23,22 +23,21 @@ function canDragX(draggable) {
 			draggable.props.axis === 'x';
 }
 
-function isFunction(fn) {
-	return typeof fn === 'function';
-}
-
 function matchesSelector(el, selector) {
-	if (isFunction(el.matches)) {
-		return el.matches(selector);
-	} else if (isFunction(el.webkitMatchesSelector)) {
-		return el.webkitMatchesSelector(selector);
-	} else if (isFunction(el.mozMatchesSelector)) {
-		return el.mozMatchesSelector(selector);
-	} else if (isFunction(el.msMatchesSelector)) {
-		return el.msMatchesSelector(selector);
-	} else if (isFunction(el.oMatchesSelector)) {
-		return el.oMatchesSelector(selector);
-	}
+    var matcheMethods = [
+            'matches',
+            'webkitMatchesSelector',
+            'mozMatchesSelector',
+            'msMatchesSelector',
+            'oMatchesSelector'
+        ],
+        length = matcheMethods.length;
+
+    for (var i = 0; i < length; i++) {
+        if (typeof el[matcheMethods[i]] === 'function') {
+            return el[matcheMethods[i]](selector);
+        }
+    }
 }
 
 function addEvent(el, event, handler) {