How to change the key which is inside an Object: JavaScript

Question

let object1 = { "hello" : [5, 12, 8, 130, 44], "hello1" : [7, 12, 8, 130, 44]};

const oldKey = "hello";
const newKey = "hello4;
const index = Object.keys(object1).findIndex(e => e === oldKey);
Object.keys(object1)[index] = newKey;

console.log(object1);

The key is not changing here for some reason.

I think [this](https://stackoverflow.com/questions/4647817/javascript-object-rename-key) is what you're looking for — Sowmen Rahman, Jun 28 '21 at 00:24
That does answer my question but the index of that key: value is changing and I don't want that. Since, the index is changing the position of that key: value is also changing inside an object — dummy, Jun 28 '21 at 00:37
the index of the key is irrelevant and has no meaning, ever - never rely on the order of object keys — Jaromanda X, Jun 28 '21 at 00:40
@dummy - presented an answer if you use `let` (or `var` for that matter) — Jaromanda X, Jun 28 '21 at 00:45

Jaromanda X · Accepted Answer · 2021-06-28T00:44:10.953

0

Begin by setting new key value to old key

then delete the old key

const object1 = { "hello" : [5, 12, 8, 130, 44], "hello1" : [7, 12, 8, 130, 44]};

const oldKey = "hello";
const newKey = "hello4";
object1[newKey]=object1[oldKey];
delete object1[oldKey];

console.log(object1);

edit: now that you changed from const object1 to let object1 there is another way!!

let object1 = { "hello" : [5, 12, 8, 130, 44], "hello1" : [7, 12, 8, 130, 44]};

const oldKey = "hello";
const newKey = "hello4";
object1 = Object.fromEntries(Object.entries(object1).map(([k, v]) => [k === oldKey ? newKey : k, v]))
console.log(object1);

edited Jun 28 '21 at 00:44

answered Jun 28 '21 at 00:12

Jaromanda X

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It is working, but is it possible to only edit the key instead of assigning the values to the new key and delete the previous one? – dummy Jun 28 '21 at 00:21
@dummy - not for a `const` - why do you have something against `delete`? – Jaromanda X Jun 28 '21 at 00:33
Sry, const was my mistake in here, I have changed it. Problem still remains – dummy Jun 28 '21 at 00:38
what problem? you want to use let, then use the duplicates given in your question – Jaromanda X Jun 28 '21 at 00:40
see edit for solution now that you use `let` @dummy – Jaromanda X Jun 28 '21 at 00:44

How to change the key which is inside an Object: JavaScript

1 Answers1