selector for redux

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1import { createSelector } from 'reselect';
2
3const getProducts = state => state.products.itemsById;
4const getCartItemIds = state => state.currentUser.shoppingCart.itemIds;
5
6export const selectShoppingCartItems = createSelector(
7  getProducts,
8  getCartItemIds,
9  (products, itemIds) => itemIds.map(id => products[id])
10);

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