Javascript嵌套数组检查值是否存在

Question

我正在为我的应用程序使用 React。我正在尝试制作一个送餐应用程序。在我的应用程序中有多家餐厅。有些餐厅有送货时间，有些没有。所有餐厅都有下一个 7 天的日期。

有些餐厅没有前两天的送货时间，但之后餐厅有一周剩余时间的送货时间。有些餐厅在接下来的 7 天内根本没有送货时间。

我想创建一个辅助函数来检查餐厅数据中是否有送货时间。

PS：我正在努力学习单元测试。如果你展示那就太棒了 我如何对我的辅助函数进行单元测试。

这是我的示例数据，其中有日期和交货时间：

 {
  deliveryMethod: "PICKUP",
  deliverySlots: [
    {
      date: "2021-08-04",
      deliveryTimes: [],
    },
    {
      date: "2021-08-05",
      deliveryTimes: [],
    },
    {
      date: "2021-08-06",
      deliveryTimes: [],
    },
    {
      date: "2021-08-07",
      deliveryTimes: [
        {
          time: "16:30-17:00",
          validFrom: "2020-08-07",
          validUntil: "2023-08-07",
        },
        { 
          time: "18:00-19:00",
          validFrom: "2020-08-07",
          validUntil: "2023-08-07",
        },
      ],
    },
  ],
}

这是我的示例数据，其中有日期但没有交货时间：

 {
  deliveryMethod: "PICKUP",
  deliverySlots: [
    {
      date: "2021-08-04",
      deliveryTimes: [],
    },
    {
      date: "2021-08-05",
      deliveryTimes: [],
    },
    {
      date: "2021-08-06",
      deliveryTimes: [],
    },
    {
      date: "2021-08-07",
      deliveryTimes: [],
    },
  ],
}

将值传递给函数后，我坚持如何检查是否存在任何交货时间。

const deliveryArea = {
  deliveryMethod: "PICKUP",
  deliverySlots: [
    {
      date: "2021-08-04",
      deliveryTimes: [],
    },
    {
      date: "2021-08-05",
      deliveryTimes: [],
    },
    {
      date: "2021-08-06",
      deliveryTimes: [],
    },
    {
      date: "2021-08-07",
      deliveryTimes: [
        {
         
          time: "16:30-17:00",
          validFrom: "2020-08-07",
          validUntil: "2023-08-07",
        },
        {
         
          time: "18:00-19:00",
          validFrom: "2020-08-07",
          validUntil: "2023-08-07",
        },
      ],
    },
    {
      date: "2021-08-08",
      deliveryTimes: [
        {
         
          time: "16:30-17:00",
          validFrom: "2020-08-08",
          validUntil: "2023-08-08",
        },
        {
        
          time: "18:00-19:00",
          validFrom: "2020-08-07",
          validUntil: "2023-08-07",
        },
      ],
    },
    {
      date: "2021-08-09",
      deliveryTimes: [],
    },
    {
      date: "2021-08-10",
      deliveryTimes: [
        {
         
          time: "16:30-17:00",
          validFrom: "2020-08-10",
          validUntil: "2023-08-10",
        },
        {
         
          time: "18:00-19:00",
          validFrom: "2020-08-10",
          validUntil: "2023-08-10",
        },
      ],
    },
  ],
};

const helperFunction = (deliveryArea) => {
  console.log(deliveryArea); // in here i stuck
};

helperFunction(deliveryArea);

Answer 1

您可以使用Array.prototype.some() 来检查是否存在至少一个deliverytimes 不为空的插槽：

const deliveryArea = { deliveryMethod: "PICKUP", deliverySlots: [{date: "2021-08-04", deliveryTimes: [],},{date: "2021-08-05", deliveryTimes: [],},{date: "2021-08-06", deliveryTimes: [],},{date: "2021-08-07", deliveryTimes: [{startTime: 600,time: "16:30-17:00", validFrom: "2020-08-07", validUntil: "2023-08-07", },{startTime: 660,time: "18:00-19:00", validFrom: "2020-08-07", validUntil: "2023-08-07", },],},{date: "2021-08-08", deliveryTimes: [],},{date: "2021-08-09", deliveryTimes: [],},{date: "2021-08-10", deliveryTimes: [{startTime: 600,time: "16:30-17:00", validFrom: "2020-08-10", validUntil: "2023-08-10", },{startTime: 660,time: "18:00-19:00", validFrom: "2020-08-10", validUntil: "2023-08-10", },],},],};
const deliveryAreaWithNoDeliveryTimes = { deliveryMethod: "PICKUP", deliverySlots: [{date: "2021-08-04", deliveryTimes: [],},{date: "2021-08-05", deliveryTimes: [],},{date: "2021-08-06", deliveryTimes: [],},{date: "2021-08-07", deliveryTimes: [],},],};

// will return true if there are any delivery times defined, false otherwise
const hasDeliveryTimes = (deliveryArea) => {
  return deliveryArea.deliverySlots.some((slot) => {
    return slot.deliveryTimes.length;
  });
};

console.log(hasDeliveryTimes(deliveryArea));
console.log(hasDeliveryTimes(deliveryAreaWithNoDeliveryTimes));