Question

我有两个对象：

Group，其users属性，包含一个ObjectIds数组：

["59f5c8b62f73d036bc4f5673","59f5c7d42f73d036bc4f566b",
"59f5c81a2f73d036bc4f566d","59f5c8482f73d036bc4f566f"]

另一个对象有一个属性，需要使用精确的objectIds数组填充，所以当我在后面创建它时，它现在看起来像这样：

var object = new Object({
      title: req.body.title
      group: req.params.id,
      objectArray: { user: group.users, value: 1 }
    });

我期待得到如下人口：

object: {
    title: some-title,
    group: someRefId,
    objectArray: [ 
       {user: ObjectId1, value: 1},
       {user: ObjectId2, value: 1},
       {user: ObjectId3, value: 1},
       {user: ObjectId4, value: 1}
    ]
}

我需要以某种方式遍历该数组，然后声明{user: user of group.users, value:1}或其他东西。我不明白如何在声明一个新对象时迭代该数组...

Answer 1

＆＃13;

var req = {
  body: {
    title: 'some-title'
  },
  params: {
    id: 'someRefId'
  }
};

var group = {
  users: [
    "59f5c8b62f73d036bc4f5673",
    "59f5c7d42f73d036bc4f566b",
    "59f5c81a2f73d036bc4f566d",
    "59f5c8482f73d036bc4f566f"
  ]
};

var object = {
  title: req.body.title,
  group: req.params.id,
  objectArray: group.users.map(function(user) {
    return {
      user: user,
      value: 1
    };
  })
};

console.log(object);

＆＃13;

Answer 2

您可以使用Array.prototype.map执行此操作。

<强> ES6

...
objectArray: group.users.map((user) => ({ user, value: 1 }))
...

<强> ES5

...
objectArray: group.users.map(function (user) {
    return { 
        user: user, 
        value: 1 
    };
})
...

将数组复制到另一个对象属性javascript

2 个答案: