function createReducer(initialState, handlers) {    return function reducer(state = initialState, action) {        if (handlers.hasOwnProperty(action.type)) {            return handlers[action.type](state, action)        } else {            return state        }    }}const todosreducer = createReducer([], {    'ADD_TODO': addTodo,    'TOGGLE_TODO': toggleTodo,    'EDIT_TODO': editTodo});