javascript - 每个 id 的嵌套对象求和

Question

我需要根据“fromSuppliers”属性中的id对产品数组属性中的所有“价格”求和。最好的方法是什么？我尝试过使用 map 和 reduce，但没有成功。任何帮助将不胜感激。

此示例的预期输出：

[  
  { id: 1, totalPrice: 19,84 }
  { id: 2, totalPrice: 9.84 }
]

对象：

const Jsonresult = {
    items: {
      '**9089**': {
        createdAt: '2021-02-11T17:25:22.960-03:00',
        product: [{
            fromSuppliers: {
                productSupplier: {
                    stock: 102,
                    promoPrice: 16,
                },
                '**id**': 2
            }
        }],
        total: 9.84,
        quantity: 1,
        price: '**9.84**',
        updatedAt: '2021-02-11T17:25:22.960-03:00'
      },
      '**9090**': {
        createdAt: '2021-02-11T17:25:22.960-03:00',
        product: [{
            fromSuppliers: {
                productSupplier: {
                    stock: 102,
                    promoPrice: 7,
                },
                '**id**': 1
            }
        }],
        total: 9.84,
        quantity: 1,
        '**price**': 9.84,
        updatedAt: '2021-02-11T17:25:22.960-03:00'
      },
      '**9091**': {
        createdAt: '2021-02-11T17:25:22.960-03:00',
        product: [{
            fromSuppliers: {
                productSupplier: {
                    stock: 102,
                    promoPrice: 7,
                },
                '**id**': 1
            }
        }],
        total: 9.84,
        quantity: 1,
        '**price**': 10,
        updatedAt: '2021-02-11T17:25:22.960-03:00'
    },
}

标签： javascriptarraysjsonreducenested-object

Answer 1

您可以使用Object.values()来获取您的items. 然后我们将使用Array.reduce()创建一个地图对象，以id. 我们将再次使用 Object.values 将地图对象转换为数组。

const Jsonresult = { items: { '9089': { createdAt: '2021-02-11T17:25:22.960-03:00', product: [{ fromSuppliers: { productSupplier: { stock: 102, promoPrice: 16, }, id: 2 } }], total: 9.84, quantity: 1, price: 9.84, updatedAt: '2021-02-11T17:25:22.960-03:00' }, '9090': { createdAt: '2021-02-11T17:25:22.960-03:00', product: [{ fromSuppliers: { productSupplier: { stock: 102, promoPrice: 7, }, id: 1 } }], total: 9.84, quantity: 1, price: 9.84, updatedAt: '2021-02-11T17:25:22.960-03:00' }, '9091': { createdAt: '2021-02-11T17:25:22.960-03:00', product: [{ fromSuppliers: { productSupplier: { stock: 102, promoPrice: 7, }, id: 1 } }], total: 9.84, quantity: 1, price: 10, updatedAt: '2021-02-11T17:25:22.960-03:00' }, } };

const items = Object.values(Jsonresult.items);
const result = Object.values(items.reduce((acc, { price, product: [ { fromSuppliers: { id }} ]}) => {
    if (!acc[id]) acc[id] = { id, price: 0 };
    acc[id].price += price;
    return acc;
}, {}));

console.log(result)

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