Created reducer and stateactions for lobby.

app/src/reducers/lobbyPeers.js

@@ -0,0 +1,52 @@
+const lobbyPeer = (state = {}, action) =>
+{
+	switch (action.type) 
+	{
+		case 'ADD_LOBBY_PEER':
+			return action.payload.lobbyPeer;
+
+		case 'SET_LOBBY_PEER_DISPLAY_NAME':
+			return { ...state, displayName: action.payload.displayName };
+
+		default:
+			return state;
+	}
+};
+
+const lobbyPeers = (state = {}, action) =>
+{
+	switch (action.type)
+	{
+		case 'ADD_LOBBY_PEER':
+		{
+			return { ...state, [action.payload.lobbyPeer.id]: lobbyPeer(undefined, action) };
+		}
+
+		case 'REMOVE_LOBBY_PEER':
+		{
+			const { peerId } = action.payload;
+			const newState = { ...state };
+
+			delete newState[peerId];
+
+			return newState;
+		}
+
+		case 'SET_LOBBY_PEER_DISPLAY_NAME':
+		{
+			const oldLobbyPeer = state[action.payload.peerId];
+
+			if (!oldLobbyPeer) 
+			{
+				throw new Error('no Peer found');
+			}
+
+			return { ...state, [oldLobbyPeer.id]: lobbyPeer(oldLobbyPeer, action) };
+		}
+
+		default:
+			return state;
+	}
+};
+
+export default lobbyPeers;