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首页 > 解决方案 > 如何从嵌套在对象内部数组中的对象中提取值并将其存储在不同的数组中 JAVASCRIPT

javascript - 如何从嵌套在对象内部数组中的对象中提取值并将其存储在不同的数组中 JAVASCRIPT

问题描述

[{
    "_id": "5fd6288a155cda5a10d067fa",
    "contacts": [
        {
            "_id": "5fd6288a155cda5a10d067fb",
            "id": "5fd35931ec23f76d387d8464",
            "name": "dean"
        },
        {
            "_id": "5fd6288a155cda5a10d067fc",
            "id": "12",
            "name": "john"
        },
        {
            "_id": "5fd6288a155cda5a10d067fd",
            "id": "1",
            "name": "brad"
        }
    ],
    "messages": [],
    "__v": 0
},
{
    "_id": "5fd63ab97aac3826f8e64558",
    "contacts": [
        {
            "_id": "5fd63ab97aac3826f8e64559",
            "id": "5fd35931ec23f76d387d8464",
            "name": "dean"
        },
        {
            "_id": "5fd63ab97aac3826f8e6455a",
            "id": "12",
            "name": "brad"
        }
    ],
    "messages": [],
    "__v": 0
}]

快速概览：每个对象都包含不同的对话数据。我想从每个对话中提取名称并将它们存储在一个单独的数组中。例如：[[dean, john, brad], [dean, brad]]

标签： javascriptarraysobject

解决方案

const arr = [{
    "_id": "5fd6288a155cda5a10d067fa",
    "contacts": [{
        "_id": "5fd6288a155cda5a10d067fb",
        "id": "5fd35931ec23f76d387d8464",
        "name": "dean"
      },
      {
        "_id": "5fd6288a155cda5a10d067fc",
        "id": "12",
        "name": "john"
      },
      {
        "_id": "5fd6288a155cda5a10d067fd",
        "id": "1",
        "name": "brad"
      }
    ],
    "messages": [],
    "__v": 0
  },
  {
    "_id": "5fd63ab97aac3826f8e64558",
    "contacts": [{
        "_id": "5fd63ab97aac3826f8e64559",
        "id": "5fd35931ec23f76d387d8464",
        "name": "dean"
      },
      {
        "_id": "5fd63ab97aac3826f8e6455a",
        "id": "12",
        "name": "brad"
      }
    ],
    "messages": [],
    "__v": 0
  }
];

const people = arr.map(ele => ele.contacts.map(contact => contact.name));
console.log(people);

映射数组：

const people = arr.map(ele => ele.contacts.map(contact => contact.name));

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