Common subexpression in emit.

lib/events.js

@@ -18,27 +18,25 @@ EventEmitter.prototype.emit = function (type) {
   }
 
   if (!this._events) return false;
-  if (!this._events[type]) return false;
+  var handler = this._events[type];
+  if (!handler) return false;
 
-  if (typeof this._events[type] == 'function') {
+  if (typeof handler == 'function') {
     if (arguments.length <= 3) {
       // fast case
-      this._events[type].call( this
-                             , arguments[1]
-                             , arguments[2]
-                             );
+      handler.call(this, arguments[1], arguments[2]);
     } else {
       // slower
       var args = Array.prototype.slice.call(arguments, 1);
-      this._events[type].apply(this, args);
+      handler.apply(this, args);
     }
     return true;
 
-  } else if (isArray(this._events[type])) {
+  } else if (isArray(handler)) {
     var args = Array.prototype.slice.call(arguments, 1);
 
 
-    var listeners = this._events[type].slice(0);
+    var listeners = handler.slice();
     for (var i = 0, l = listeners.length; i < l; i++) {
       listeners[i].apply(this, args);
     }