events: emit cleanup

Cleanup check logic. Place vars at top. Remove PROCESS.

lib/events.js

@@ -50,43 +50,38 @@ EventEmitter.prototype.setMaxListeners = function(n) {
   this._maxListeners = n;
 };
 
-// non-global reference, for speed.
-var PROCESS;
-
 EventEmitter.prototype.emit = function(type) {
+  var er, handler, len, args, i, listeners;
+
   // If there is no 'error' event listener then throw.
   if (type === 'error') {
     if (!this._events.error ||
         (typeof this._events.error === 'object' &&
          !this._events.error.length)) {
+      er = arguments[1];
       if (this.domain) {
-        var er = arguments[1];
         er.domainEmitter = this;
         er.domain = this.domain;
         er.domainThrown = false;
         this.domain.emit('error', er);
-        return false;
-      }
-
-      if (arguments[1] instanceof Error) {
-        throw arguments[1]; // Unhandled 'error' event
+      } else if (er instanceof Error) {
+        throw er; // Unhandled 'error' event
       } else {
-        throw TypeError("Uncaught, unspecified 'error' event.");
+        throw TypeError('Uncaught, unspecified "error" event.');
       }
       return false;
     }
   }
 
-  var handler = this._events[type];
-  if (!handler) return false;
+  handler = this._events[type];
+
+  if (typeof handler === 'undefined')
+    return false;
+
+  if (this.domain && this !== process)
+    this.domain.enter();
 
   if (typeof handler == 'function') {
-    if (this.domain) {
-      PROCESS = PROCESS || process;
-      if (this !== PROCESS) {
-        this.domain.enter();
-      }
-    }
     switch (arguments.length) {
       // fast cases
       case 1:
@@ -100,39 +95,28 @@ EventEmitter.prototype.emit = function(type) {
         break;
       // slower
       default:
-        var l = arguments.length;
-        var args = new Array(l - 1);
-        for (var i = 1; i < l; i++) args[i - 1] = arguments[i];
+        len = arguments.length;
+        args = new Array(len - 1);
+        for (i = 1; i < len; i++)
+          args[i - 1] = arguments[i];
         handler.apply(this, args);
     }
-    if (this.domain && this !== PROCESS) {
-      this.domain.exit();
-    }
-    return true;
-
   } else if (typeof handler === 'object') {
-    if (this.domain) {
-      PROCESS = PROCESS || process;
-      if (this !== PROCESS) {
-        this.domain.enter();
-      }
-    }
-    var l = arguments.length;
-    var args = new Array(l - 1);
-    for (var i = 1; i < l; i++) args[i - 1] = arguments[i];
-
-    var listeners = handler.slice();
-    for (var i = 0, l = listeners.length; i < l; i++) {
+    len = arguments.length;
+    args = new Array(len - 1);
+    for (i = 1; i < len; i++)
+      args[i - 1] = arguments[i];
+
+    listeners = handler.slice();
+    len = listeners.length;
+    for (i = 0; i < len; i++)
       listeners[i].apply(this, args);
-    }
-    if (this.domain && this !== PROCESS) {
-      this.domain.exit();
-    }
-    return true;
-
-  } else {
-    return false;
   }
+
+  if (this.domain && this !== process)
+    this.domain.exit();
+
+  return true;
 };
 
 EventEmitter.prototype.addListener = function(type, listener) {