Как отфильтровать массив в reducer-е, react/redux?

const fetchDataReducer = (state = initState, action) => {
	switch (action.type) {
		case FETCH_REQUEST:
			return state;
		case FETCH_SUCCESS:
			return {
				...state,
				companyData: action.company_list,

			};
		case FETCH_ERROR:
			return {
				...state,
				companyData: action.payload,
			};
		case GET_SOCKET_DATA:
			return {
				...state,
				companyData: state.carFilterMode ? state.companyData : mergeSocketData(state.companyData, action.socketData),
				// companyDataImm: state.carFilterMode ? state.companyData : mergeSocketData(state.companyData, action.socketData)
			};
		case CAR_FILTER:
			console.log(state)
			return {
				...state,
				carFilterMode: true,
                               companyData: state.companyData.filter((item) => item.n.toLowerCase().indexOf(action.text.toLowerCase()) > -1)
			};
		default:
			return state
	}
};

case CAR_FILTER:
      console.log(state)
      return {
        ...state,
        carFilterMode: true,
                               companyData: arr.filter((item) => item.n.toLowerCase().indexOf(text.toLowerCase()) > -1)
      };

case CAR_FILTER:
      
     let cars=[]
 cars=state.companyData.filter((item) => item.n.toLowerCase().indexOf(action.text.toLowerCase()) > -1)

console.log(state,cars)
      return {
        ...state,
        carFilterMode: true,
                               companyData: cars
      };