copying array to another object property javascript

Question

I have two objects:

Group which has a users property, containing an array of ObjectIds:

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

And another object which has a property which needs to be populated with that exact array of objectIds, so when I create it in the back, it looks like this right now:

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

I am expecting to get the population as follows:

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

I need to iterate through that array somehow and then declare {user: user of group.users, value:1} or something. I don't understand how to iterate through that array while declaring a new object...

You may want to look at Array.prototype.map.

fubar
– fubar

2017-11-06 00:13:55 +00:00
Commented Nov 6, 2017 at 0:13 — fubar
– fubar, Commented Nov 6, 2017 at 0:13

Alec Fenichel · Accepted Answer · 2017-11-06 00:17:46Z

4

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);

answered Nov 6, 2017 at 0:17

Alec Fenichel

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Comments

fubar · Accepted Answer · 2017-11-06 00:16:46Z

1

You could use Array.prototype.map to do this.

ES6

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

ES5

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

answered Nov 6, 2017 at 0:16

fubar

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