basket, remove item, price, total price #45
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koretskiyav
reviewed
Dec 10, 2021
| @@ -8,6 +8,9 @@ export default function (state = {}, action) { | |||
| return { ...state, [id]: (state[id] || 0) + 1 }; | |||
| case DECREMENT: | |||
| return { ...state, [id]: (state[id] || 0) - 1 }; | |||
| case REMOVE_ITEM: | |||
| delete state[id]; | |||
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это мутация данных предыдущего стейта, этого делать нельзя
koretskiyav
reviewed
Dec 10, 2021
| import styles from './basket.module.css'; | ||
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| const Basket = ({ order, decrement, increment, restaurants, removeItem, handleBasket}) => { | ||
| const dishes = [...restaurants].map(item => item.menu.map(item2 => item2)).flat(2); |
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это вычисление лучше мемоизировать
koretskiyav
reviewed
Dec 10, 2021
| } | ||
| }) | ||
| } | ||
| const totalPrice = selectedItems.reduce(( prev, cur ) => prev + cur.price*cur.qty, 0) |
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и в целом все эти вычисления можно вынести в mapStateToProps
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