Implemented Manager.map & Manager.filter; Changes to Manager.forEach

lib/ws/manager.js

@@ -86,11 +86,44 @@ Manager.prototype.find = function(id, callback){
   }
 };
 
-Manager.prototype.forEach = function(callback){
+Manager.prototype.forEach = function(callback, thisArg){
   var current = this._head;
 
   while(current !== null){
-    callback(current.client);
+    callback.call(thisArg, current.client);
     current = current._next;
   }
+};
+
+Manager.prototype.map = function(callback, thisArg){
+  var current = this._head
+    , len = 0
+    , result = new Array(this._length);
+    , mappedValue;
+
+  while(current !== null){
+    result[len] = callback.call(thisArg, current.client, len, this._head);
+    current = current._next;
+    ++len;
+  }
+
+  return result;
+};
+
+Manager.prototype.filter = function(callback, thisArg){
+  var current = this._head
+    , len = 0
+    , result = new Array(this._length);
+    , mappedValue;
+
+  while(current !== null){
+    if( Boolean(callback.call(thisArg, current.client, len, this._head)) ){
+      result[len] = current.client;
+      ++len;
+    }
+
+    current = current._next;
+  }
+
+  return result;
 };