formatting

src/Illuminate/Notifications/Events/BroadcastNotificationCreated.php

@@ -60,23 +60,19 @@ public function broadcastOn()
             return $channels;
         }
 
-        $channelNames = $this->channelName();
-        if (is_string($channelNames)) {
-            return [new PrivateChannel($channelNames)];
+        if (is_string($channels = $this->channelName())) {
+            return [new PrivateChannel($channels)];
         }
 
-        $channels = [];
-        foreach ($channelNames as $channel) {
-            $channels[] = new PrivateChannel($channel);
-        }
-
-        return $channels;
+        return collect($channels)->map(function ($channel) {
+            return new PrivateChannel($channel);
+        })->all();
     }
 
     /**
      * Get the broadcast channel name for the event.
      *
-     * @return string|array
+     * @return array|string
      */
     protected function channelName()
     {