Deleting world when empty.

back/src/Controller/IoSocketController.ts

@@ -297,6 +297,9 @@ export class IoSocketController {
             const world : World|undefined = this.Worlds.get(Client.roomId);
             if(world){
                 world.leave(Client);
+                if (world.isEmpty()) {
+                    this.Worlds.delete(Client.roomId);
+                }
             }
             //user leave previous room
             Client.leave(Client.roomId);

back/src/Model/World.ts

@@ -72,6 +72,10 @@ export class World {
         this.users.delete(user.userId);
     }
 
+    public isEmpty(): boolean {
+        return this.users.size === 0;
+    }
+
     public updatePosition(socket : Identificable, userPosition: PointInterface): void {
         const user = this.users.get(socket.userId);
         if(typeof user === 'undefined') {