resourceloader: Reduce size of ES5 StringSet fallback

Over 90% of browsers have ES6 Set implemented.
Make the fallback a bit smaller.

Change-Id: Icfd18cbeac6d95702ac409297a01c81829d5a41b

diff --git a/resources/src/startup/mediawiki.js b/resources/src/startup/mediawiki.js
index e110b95..a0c7c61 100644 (file)
--- a/resources/src/startup/mediawiki.js
+++ b/resources/src/startup/mediawiki.js
@@ -52,13 +52,15 @@
                 * @private
                 * @class
                 */
-               StringSet = window.Set || function StringSet() {
+               StringSet = window.Set || function () {
                        var set = Object.create( null );
-                       this.add = function ( value ) {
-                               set[ value ] = true;
-                       };
-                       this.has = function ( value ) {
-                               return value in set;
+                       return {
+                               add: function ( value ) {
+                                       set[ value ] = true;
+                               },
+                               has: function ( value ) {
+                                       return value in set;
+                               }
                        };
                };
        }