javascript - 如何从javascript中的对象获取特定的键值？

Question

我有一个对象，我想创建一个具有特定键值的新对象，例如，

我有一个代码如下:

var objArray = [{
    "firstname": "bbb",
    "userName": "bbb1",
    "title": "",
    "created_by_user_id": "-1",
    "enabled": "true",
    "lastname": "AC",
    "last_connection": "",
    "password": "",
    "manager_id": "0",
    "id": "14",
    "job_title": "job1",
    "last_update_date": "2018-08-08 13:35:56.996"
  },
  {
    "firstname": "aaa",
    "icon": "icons/default/icon_user.png",
    "creation_date": "2018-08-08 13:35:56.876",
    "userName": "aaa1",
    "title": "",
    "created_by_user_id": "-1",
    "enabled": "true",
    "lastname": "AH",
    "last_connection": "",
    "password": "",
    "manager_id": "0",
    "id": "9",
    "job_title": "job2",
    "last_update_date": "2018-08-08 13:35:56.876"
  }
]
for (var i = 0; i < obj.length; i++) {
  objArray.push(obj[i]["id"]);
}
return objArray

我想创建一个像

这样的新对象

[{
  "id": "14"
}, {

  "id": "9",
}]

但是，我的结果是

[
  "9",
  "3"
]

我想得到一个对象的结果。感谢您的帮助。

提前致谢

Answer 1

只需将数组映射到仅包含指定键和值的新对象数组:

objArray.map(({ id }) => ({ id }));

这是一个例子:

var objArray = [{
    "firstname": "bbb",
    "userName": "bbb1",
    "title": "",
    "created_by_user_id": "-1",
    "enabled": "true",
    "lastname": "AC",
    "last_connection": "",
    "password": "",
    "manager_id": "0",
    "id": "14",
    "job_title": "job1",
    "last_update_date": "2018-08-08 13:35:56.996"
  },
  {
    "firstname": "aaa",
    "icon": "icons/default/icon_user.png",
    "creation_date": "2018-08-08 13:35:56.876",
    "userName": "aaa1",
    "title": "",
    "created_by_user_id": "-1",
    "enabled": "true",
    "lastname": "AH",
    "last_connection": "",
    "password": "",
    "manager_id": "0",
    "id": "9",
    "job_title": "job2",
    "last_update_date": "2018-08-08 13:35:56.876"
  }
];

var processed = objArray.map(({ id }) => ({ id }));
console.log(processed);