Javascript TypeError:filteredProducts.slice不是Redux中的函数

所以我想复制filteredproducts并将其设置为sortProducts，但是当我使用slice方法时。我得到一个错误：TypeError:filteredProducts.slice不是Redux中的函数

我曾试图使filteredProducts成为正则变量，但没有成功。这是怎么回事

守则行动：

const sortProducts = (filteredProducts=[], sort)=> (dispatch)=> {
    const sortedProducts = filteredProducts.slice()
    if(sort === 'latest'){
        //sort by id
        sortedProducts.sort((a,b)=> (a.id > b.id? 1: -1))
    }else {
        sortedProducts.sort((a,b)=> (
            //highest to lowest
            sort === "lowest"? a.price > b.price? 1: -1
            :
            a.price > b.price? -1: 1 //lowest to highest
        ))
    }
    dispatch({
        type: actions.ORDER_PRODUCTS_BY_PRICE,
        payload: {
            sort:sort,
            items: sortedProducts
        }
    })
}

代码缩减器：

    function filteredProductsReducer (state={}, action) {
    switch(action.type){
        case actions.ORDER_PRODUCTS_BY_PRICE:
            return {
                ...state,
                filteredItems: action.payload.items,
                sort: action.payload.sort
            }
        default:
            return state
    }

}

代码reduxStore：

import {createStore, combineReducers, applyMiddleware, compose} from 'redux'
import {producListReducer, productDetailsReducer, filteredProductsReducer} from './reducers/productReducers'
import thunk from 'redux-thunk'
import {userLoginReducer} from './reducers/UserReducer'
import shopReducer from './reducers/cartReducers'



//what should i do here?
const initialState = {}

const reducer = combineReducers({
// accepts name props
//reducer is a function that gets a state and a action and returns a new state based on the action
productList: producListReducer ,
productDetails: productDetailsReducer,
productFilter: filteredProductsReducer,
userLogin: userLoginReducer,
cart: shopReducer
})
const store = createStore(reducer,initialState, compose(applyMiddleware(thunk)))

export default store

---

有可能将

对象

作为

filteredProducts

而不是

数组

传递。