How to get the key of an object array if the value is true

Question

I have an object. I want to get the keys if the value is true.

What I have tried :

const data = [{superadmin: true, admin: false, user: false}]
keys = Object.keys(data).filter(k => data[k]);
console.log(typeof(data));
console.log(data)
console.log(keys)

Expected Output :

["superadmin"]

Your keys are in `data[0]` not `data` - you'll need to iterate over `data` — Randy Casburn, Dec 21 '22 at 17:12
Does this answer your question? [How do I loop through or enumerate a JavaScript object?](https://stackoverflow.com/questions/684672/how-do-i-loop-through-or-enumerate-a-javascript-object) — Istvan Tabanyi, Dec 21 '22 at 17:21

Onki Hara · Answer 1 · 2022-12-21T17:16:54.410

1

For the given code

keys = Object.keys(data[0]).filter(k => data[0][k] === true);

should work.

edited Dec 21 '22 at 17:16

answered Dec 21 '22 at 17:13

Onki Hara

270
1
9

I did edit the answer - please try now – Onki Hara Dec 21 '22 at 17:18
Then your input data is not what you put in the question. – Istvan Tabanyi Dec 21 '22 at 17:19

score 1 · Accepted Answer · answered Dec 21 '22 at 17:17

1

This works

const data = [{
  superadmin: true,
  admin: false,
  user: false
}]
keys = data.map(obj => {
  const data = Object.keys(obj).filter((key) => {
    return !!obj[key]
  })

  return data
}).flat(1);

console.log(keys)

answered Dec 21 '22 at 17:17

unhackit

543
3
9

score 1 · Answer 3 · answered Dec 21 '22 at 17:31

Instead returning value, you simply assign the keys with a value of true to a variable, like this

const data = [{superadmin: true, admin: false, user: false}]
let mkeys
data.map((obj) => {
  mkeys = Object.keys(obj).filter(k => obj[k])
})
console.log(mkeys)

score 0 · Answer 4 · answered Dec 21 '22 at 17:17

0

This is very simple:

let keys=[];
for (let [key, value] of Object.entries(data)){
    if (data[key]) keys.push(key)
}
console.log(keys)

If you want one line:

keys = Object.keys(data).filter(k => data[k]);

answered Dec 21 '22 at 17:17

Stefano Leone

635
5
14

How to get the key of an object array if the value is true

4 Answers4