在具有特定属性的数组中的其他对象之前插入数组中的对象

编程问答 2022-05-17

问题描述

我有一个带有对象的数组。所有对象都有一个唯一的 id。现在我想在具有特定 id 的对象之前插入一个新对象。为此，我得到了这个对象：

{"topic":"add","payload":{"id":1,"end":"24:00","temp":21,"add":0,"delete":0},"row":-1,"socketid":"SSZY-1C3jiP8-NS2AAAB","_msgid":"a891f409.e30038"}

现在我需要在这个带有 id 的数组中找到这个对象：

[{"woche":"Montag","status":0,"_children":[{"id":1,"delete":0}]},{"woche":"Dienstag","vortag":1,"_children":[{"id":2,{"woche":"Mittwoch","start":"","_children":[{"id":3,{"woche":"Donnerstag","_children":[{"id":4,{"woche":"Freitag","_children":[{"id":5,{"woche":"Samstag","_children":[{"id":6,{"woche":"Sonntag","_children":[{"id":7,"delete":0}]}]

现在我想在具有匹配 id 的对象之前插入一个新对象。

如何找到数组中的位置以及如何添加此对象？

{"id":`${++Id}`,"end":"","delete":0}

最后应该是这样的：

[{"woche":"Montag","_children":[{"id":"8",{"id":1,"delete":0}]}]

解决方法

您可以使用 filter 方法来检查特定元素的索引。

假设这是您的数组：

let arr = [{"woche":"Montag","status":0,"_children":[{"id":1,"end":"24:00","temp":21,"add":0,"delete":0}]},{"woche":"Dienstag","vortag":1,"_children":[{"id":2,{"woche":"Mittwoch","start":"","_children":[{"id":3,{"woche":"Donnerstag","_children":[{"id":4,{"woche":"Freitag","_children":[{"id":5,{"woche":"Samstag","_children":[{"id":6,{"woche":"Sonntag","_children":[{"id":7,"delete":0}]}]

你需要在数组中搜索这个对象的索引：

let s = {"topic":"add","payload":{"id":1,"delete":0},"row":-1,"socketid":"SSZY-1C3jiP8-NS2AAAB","_msgid":"a891f409.e30038"}

您可以使用以下查询来实现此目的：

let index = -1
arr.filter((o) => {
    if(s.payload.id === o._children[0].id) {
        index = arr.indexOf(o)
    }
    return o
})

您可以使用 splice 方法在数组中的特定索引处添加新对象。

arr.splice(index,<value to enter in array>)
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