Get Javascript nested array object values

Question

I have this Javascript object

var output = { 
   "_resolved": true, 
   "_result": [ { 
                   "title": "Pencil", 
                   "quantity": 1, 
                   "objectId": "HknL2ZAspb" 
              } ] 
}

When I try to get the value of title like this:

output._result[0].title

it returns undefined.

However

output._result[0]

correctly returns

{ "title": "Pencil", "quantity": 1, "objectId": "HknL2ZAspb" }

Any idea why output._result[0].title returns undefined? I also tried output["_result"][0]["title"] but it returns undefined too.

var output = { 
   "_resolved": true, 
   "_result": [ { 
                   "title": "Pencil", 
                   "quantity": 1, 
                   "objectId": "HknL2ZAspb" 
              } ] 
}

console.log(output._result[0].title);

Serverside code (Node):

const productsQuery = new Parse.Query(ProductTable);

output = productsQuery.get('HknL2ZAspb');   //objectID

app.get('/', (req, res) => res.send(JSON.stringify(output["_result"][0]["title"])))

Note the Query and other code is just fine. As output returns the exact object.

output._result[0].title works correctly with the data you provided. You must have a typo in your code. — VLAZ
– VLAZ, Commented May 4, 2018 at 0:16

num8er · Accepted Answer · 2018-05-04 02:22:14Z

1

Since You're using Parse and it's asynchronous thing.

From examples in official documentation I can give working example:

const ProductTable = 'products';

app.get('/products/:id', async (req, res) => {
  try {
    const productId = req.params.id;
    const query = (new Parse.Query(ProductTable))
                    .equalTo('objectId', productId);
    const result = await query.find();

    if (result[0]) {
      return res.status(200).send(result[0]);
    }
    res.status(404).send({});
  }
  catch (error) {
    res.status(500).send(error);
  }
});

Use it like: http://127.0.0.1:3000/products/HknL2ZAspb

edited May 4, 2018 at 2:22

answered May 4, 2018 at 0:33

num8er

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3 Comments

Daman Over a year ago

I do. because when i output output._result it does output an Object

pfg Over a year ago

Why does everything return the right values though? Could all the things we've tried been called later after everything has been downloaded?

num8er Over a year ago

@pfg Daman was not giving whole code, + I did not found any mention of .get to query object. Maybe it's some abstraction over Parse class. So I've just wrote proper example depending on official manual. In another hand result and resolved may be special fields of custom promise object that is being logged to console or stringified on demand.

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