CODEWITHSUNDEEP
javascriptarraysjson
ucup
ucup

Reputation: 685

how to insert javascript variable into json object

here is the function 

function createData(_id){
var _temp = '20C';
var _battery = '60%';
var _data = { _id:{temp:_temp,battery:_battery} };
console.log(_data);
}
createData('Thermometer1');

Result :

[
_id:{temp:'20C',
     battery:'60%'
    }
]

Expected Result:

[
Thermometer1:{temp:'20C',
     battery:'60%'
    }
]

ignore the text below :v

it looks like your post is mostly code; please add more detail,

i don't know what to write so here is a guitar tab

0 - 3 - 5

0 - 3 - 6 - 5

0 - 3 - 5 - 3 - 0

Upvotes: 0

Views: 87

Answers (2)

PranavB6
PranavB6

Reputation: 28

You can use object[attribute] syntax to refer to a property of an object. 

// Example:

let attr = 'candy';
let obj = {};

obj['attr'] = 'cone';
console.log(obj);     // { attr: 'cane' }

obj[attr] = 'cane';
console.log(obj);     // { attr: 'cone', candy: 'cane' }

// Your Solution:

function createData(_id) {
  var _temp = "20C";
  var _battery = "60%";
  var _data = {};

  _data[_id] = {
    temp: _temp,
    battery: _battery,
  };

  console.log(_data);
}

createData("Thermometer1"); // { Thermometer1: { temp: '20C', battery: '60%' } }

Upvotes: 0

Jacob
Jacob

Reputation: 155

Brackets around _id: 

function createData(_id){
  var _temp = '20C';
  var _battery = '60%';
  var _data = { [_id]:{temp:_temp,battery:_battery} };
  console.log(_data);
}
createData('Thermometer1');

Edit: You can use a string to define a property of an object anywhere: 

let obj = { ['prop']: 42 }
console.log(obj.prop) 
console.log(obj['prop'])

Upvotes: 1

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