Question

我有一个对象数组，每个元素看起来像这样：

DF.write
.mode(SaveMode.Overwrite)
.option("timestampFormat", "yyyy-MM-dd HH:mm")

在每个元素中都有一个提交对象数组，它们看起来像这样：

2017-02-20 06:53

唯一需要注意的属性是addAt值。我想根据日期范围过滤出提交对象。到目前为止，这是我一直没有尝试过的方法：

campaigns: (5) ["get.dentalintel.net/call-insight-DeshaunWatson", "get.dentalintel.net/practice-analysis-DeshaunWatson", "get.dentalintel.net/morning-huddle-DeshaunWatson", "get.dentalintel.net/new-morning-huddle-DeshaunWatson", "get.dentalintel.net/followups-DeshaunWatson"]
email: "dwats@gmail.com"
name: "Deshaun Watson"
submissions: [{…}]
user_id: 166

它将删除一些提交对象，但不会删除正确的对象。任何关于更好方法的建议将不胜感激。

Answer 1

要进行过滤，请使用Array.filter。这将返回一个新数组，该数组仅具有满足boolean返回的callback的值。要从现有阵列创建新阵列，请使用Array.map而不是Array.forEach。 forEach循环仅迭代这些值，但是Array.map为每个元素返回一个修改后的值或新值。

const filterByDate = () => {
    const { partners, endDate, startDate } = this.state;
    const filteredPartners = partners.map(partner => {
        return {
            ...partner,
            submissions: partner.submissions.filter(submission =>
                moment(submission.addedAt).isBetween(startDate, endDate)
            )
        };
    });
};

Array.filter和Array.map示例（无突变）

const testArray = [{
  id: 1
}, {
  id: 2
}, {
  id: 3
}, {
  id: 4
}]
const filtered = testArray.filter(e => e.id !== 3)
const mapped = testArray.map(e => {
  return {
    id: e.id,
    name: `Name of ${e.id}`
  }
})

console.log("Test Array: ", testArray)
console.log("Filtered Array: ", filtered)
console.log("Mapped Array: ", mapped)

Answer 2

您可以在此用例中使用Array.prototype.filter()

filterByDate = () => {
  const { partners, endDate, startDate } = this.state;
  partners.forEach(partner => {
    partner.submissions = partner.submissions.filter(sub =>  moment(partner.submissions[i].addedAt).isBetween(startDate, endDate));
  });
};

如何根据日期范围过滤掉对象数组中的数组？

2 个答案: