Prevent v8 deopt when using [].slice.call(arguments)

socketio · Sep 22, 2015 · d29511f · d29511f
1 parent 4d18307
commit d29511f
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/index.js b/index.js
@@ -122,9 +122,14 @@ Emitter.prototype.removeEventListener = function(event, fn){
 
 Emitter.prototype.emit = function(event){
   this._callbacks = this._callbacks || {};
-  var args = [].slice.call(arguments, 1)
+
+  var args = new Array(arguments.length - 1)
     , callbacks = this._callbacks['$' + event];
 
+  for (var i = 1; i < arguments.length; i++) {
+    args[i - 1] = arguments[i];
+  }
+
   if (callbacks) {
     callbacks = callbacks.slice(0);
     for (var i = 0, len = callbacks.length; i < len; ++i) {