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。我正试着制作一个食品递送应用程序。在我的应用程序中有多家餐厅。有些餐馆有送货时间，有些则没有。所有的餐馆都有接下来的7天约会。

有些餐厅没有前两天的送货时间，但在那之后，餐厅有一周剩余的交货时间。有些餐厅在接下来的七天内根本没有送货时间。

我想要创建一个帮助函数，它将检查餐厅的数据是否有送货时间。

PS:我正在努力学习单元测试。如果您告诉我如何对我的助手函数进行单元测试，那就太棒了。

这是我的样本数据，其中有日期和交付时间：

 {
  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",
        },
      ],
    },
  ],
}

这是我的样本数据，其中有日期和没有交付时间：

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

在将值传递给函数之后，我会继续检查是否存在交付时间。

​

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()来检查是否至少存在一个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));

​