Ticket #2803: faster-map.diff

core.js

@@ -1185 +1185 @@
         },
 
         map: function( elems, callback ) {
-                var ret = [];
+                var ret = [], value;
 
                 // Go through the array, translating each of the items to their
                 // new value (or values).
                 for ( var i = 0, length = elems.length; i < length; i++ ) {
-                        var value = callback( elems[ i ], i );
+                        value = callback( elems[ i ], i );
 
-                        if ( value !== null && value != undefined ) {
-                                if ( value.constructor != Array )
-                                        value = [ value ];
-
-                                ret = ret.concat( value );
-                        }
+                        if ( value != null )
+                                ret[ ret.length ] = value;
                 }
 
-                return ret;
+                return ret.concat.apply( [], ret );
         }
 });