Adding array of objects to object

Question

I am trying to return some data as JSON.

I have an array of values:

[
  { FieldValue: '102969', count: 1 },
  { FieldValue: 'DBFL', count: 26 },
  { FieldValue: 'Daniel', count: 1 },
  { FieldValue: 'KNI', count: 9 },
  { FieldValue: 'ON', count: 895 },
  { FieldValue: 'Ole', count: 4 },
  { FieldValue: 'TNJ', count: 133 }
]

That I am trying to add to an object, in order to get an object with a fieldname, and a values array

const objectToReturn = {
      FieldName: row.FieldName,
      FieldValues: []
    };
objectToReturn.FieldValues.push(values);

returnArr.push(objectToReturn);
console.log(returnArr);

This gives

[
  { FieldName: 'Customer ID', FieldValues: [ [Array] ] },
  { FieldName: 'Order No', FieldValues: [ [Array] ] },
  { FieldName: 'Technician ID', FieldValues: [ [Array] ] }
]

I've tried using JSON.stringify(values) in stead, giving me this return

{
    FieldName: 'Technician ID',
    FieldValues: [
      '[{"FieldValue":"102969","count":1},{"FieldValue":"DBFL","count":26},{"FieldValue":"Daniel","count":1},{"FieldValue":"KNI","count":9},{"FieldValue":"ON","count":895},{"FieldValue":"Ole","count":4},{"FieldValue":"TNJ","count":133}]'
    ]
  }

have you tried this instead, objectToReturn = { FieldName: row.FieldName, FieldValues: [...values] }; — Deepak Jha
– Deepak Jha, Commented May 21, 2022 at 15:58

Deepak Jha · Accepted Answer · 2022-05-21 16:04:05Z

1

You need to write something like this,

const objectToReturn = {
      FieldName: row.FieldName,
      FieldValues: [...values]
    };
objectToReturn.FieldValues.push(values);

returnArr.push(objectToReturn);
console.log(returnArr);

I don't agree with other answers as they will have the object reference problem, I assume you need to have a copy of values array not the array itself

answered May 21, 2022 at 16:04

Deepak Jha

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1 Comment

catu Over a year ago

Thank you Deepak, the objectToReturn.FieldValues.push(values); is obsolete now, but the spread operator worked

Kavin Sebastian · Accepted Answer · 2022-05-21 16:50:49Z

1

you can use spread operator

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax#description

for example:

FieldValues: [...values]

or

objectToReturn.FieldValues.push(...[values]);

answered May 21, 2022 at 16:50

Kavin Sebastian

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1 Comment

catu Over a year ago

Thank you Kavin, I'll read up on the spread operator - this worked wonders :)

Giverseal · Accepted Answer · 2022-05-21 15:58:40Z

0

Hi you can try to do this :

objectToReturn.FieldValues = values

but you need to declare your object as a variable

answered May 21, 2022 at 15:58

Giverseal

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