How to transform attribute values into keys?

Question

I have a JSON in the format.

var input = [
{status:"good", state: "NY"},
{status:"bad", state: "FL"},
{status:"decent", state: "CA"}
]

I want to transform it in an object of the format:

myObj = {NY:"good",FL:"bad",CA:"decent"}

The reason I want this is so that I can easily grab the myObj.NY value.

score 2 · Accepted Answer · answered Nov 19 '18 at 06:35

2

Short and simple

var input = [
  {status:"good", state: "NY"},
  {status:"bad", state: "FL"},
  {status:"decent", state: "CA"}
]
var obj = {};
input.forEach(function(k) {
  obj[k.state] = k.status;
});
console.log(obj);

answered Nov 19 '18 at 06:35

dotconnor

1,736
11
22

Gurvinder Guraya · Answer 2 · 2018-11-19T13:11:31.537

1

var myobj = {}; 
Input.forEach(function (i) { myobj[i.status] = i.state;}

edited Nov 19 '18 at 13:11

answered Nov 19 '18 at 06:36

Gurvinder Guraya

649
4
9

2

`Input.foreach` should be `input.forEach` – dotconnor Nov 19 '18 at 06:47

score 1 · Answer 3 · answered Nov 19 '18 at 06:45

You can try using "Object.assign" and "Array.map" as well like below to achieve your desired result

var input = [
{status:"good", state: "NY"},
{status:"bad", state: "FL"},
{status:"decent", state: "CA"}
]

let res = Object.assign(...input.map(({ state, status}) => ({ [state]: status })))

console.log(res)

score 0 · Answer 4 · answered Nov 19 '18 at 06:36

You can do a simple forEach() loop on that array with array destructuring to make your code short and simple.

var input = [{
    status: "good",
    state: "NY"
  },
  {
    status: "bad",
    state: "FL"
  },
  {
    status: "decent",
    state: "CA"
  }
];
var res = {};
input.forEach(({state, status})=> res[state] = status);
console.log(res);

score 0 · Answer 5 · answered Nov 19 '18 at 06:41

0

Using Array.prototype.reduce()

var myObj = input.reduce( (r,x) => { r[x.status] = x.state ; return r }, {})

answered Nov 19 '18 at 06:41

Alice Oualouest

836
12
20

briosheje · Answer 6 · 2018-11-19T07:34:47.007

0

This can be accomplished as well using map, by assigning the object key through the [key] syntax:

var input = [
{status:"good", state: "NY"},
{status:"bad", state: "FL"},
{status:"decent", state: "CA"}
]
var myObj = Object.assign({}, ...input.map(item => ({
    [item.state]: item.status
})));
console.log(myObj);

see https://jsfiddle.net/gL6bcqm1/1/

edited Nov 19 '18 at 07:34

answered Nov 19 '18 at 06:46

briosheje

7,356
2
32
54

`myObj` will be an array of objects, not a single object. Also using `Object.assign` here is unnecessary. – Felix Kling Nov 19 '18 at 06:53
Wops, sorry, misunderstood the question. Thanks for pointing that! – briosheje Nov 19 '18 at 07:34

How to transform attribute values into keys?

6 Answers6