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December 10, 2019 00:46
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Cart Reducer
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| const cartReducer = (state = { | |
| cartItems: 0, | |
| items: products, | |
| cartContents: [], | |
| }, action) => { | |
| switch (action.type) { | |
| case "ADD_TO_CART": { | |
| const existingItem = state.cartContents.find(item => { | |
| return item.id === Number(action.payload); | |
| }) | |
| let newCartContents; | |
| if (existingItem) { | |
| newCartContents = state.cartContents.map(item => { | |
| if (item.id === Number(action.payload)) { | |
| return { ...item, count: item.count + 1 } | |
| } | |
| return item; | |
| }); | |
| } else { | |
| newCartContents = [ | |
| ...state.cartContents, | |
| state.items[action.payload], | |
| ]; | |
| } | |
| state = { | |
| ...state, | |
| cartItems: state.cartItems + 1, | |
| cartContents: newCartContents, | |
| }; | |
| } | |
| break; | |
| case "SUBTRACT_ITEM": { | |
| let subtractItem = state.cartContents.map(item => { | |
| if (item.id === Number(action.payload)) { | |
| return { ...item, count: item.count - 1 } | |
| } | |
| return item; | |
| }); | |
| state = { | |
| ...state, | |
| cartItems: state.cartItems - 1, | |
| cartContents: subtractItem, | |
| }; | |
| }; | |
| break; | |
| case "ADD_ITEM": { | |
| let addItem = state.cartContents.map(item => { | |
| if (item.id === Number(action.payload)) { | |
| return { ...item, count: item.count + 1 } | |
| } | |
| return item; | |
| }); | |
| state = { | |
| ...state, | |
| cartItems: state.cartItems + 1, | |
| cartContents: addItem, | |
| }; | |
| }; | |
| break; | |
| default: | |
| } | |
| return state; | |
| }; |
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