Need a copy of value. No need referenced value

Question

I just need to copy the value of data.notes. I have used below code. But still detailsOfCurrentNotes value changes according to the value of data.notes. So could you tell me how to do this?

notes :Note[]

 const detailsOfCurrentNotes = Object.assign({}, data.notes);
 //here data.notes changes
 // detailsOfCurrentNotes also get that value

Assuming that notes is an array, try with `const detailsOfCurrentNotes = [...data.notes]`. — Striped, Mar 10 '18 at 13:26
@AyushGupta I've updated the comment, assuming the notes is an array. — Striped, Mar 10 '18 at 13:28
The duplicate was the first result after 10 seconds of searching... — Andreas, Mar 10 '18 at 13:29
Almost all answers from the duplicate work with arrays. How about first giving it a try... — Andreas, Mar 10 '18 at 13:36

score 2 · Accepted Answer · answered Mar 10 '18 at 13:26

2

If the object/array is not circular, you can simply do:

const detailsOfCurrentNotes = JSON.parse(JSON.stringify(data.notes));

answered Mar 10 '18 at 13:26

Ayush Gupta

7,958
7
50
85

score 0 · Answer 2 · answered Mar 10 '18 at 13:40

0

If notes is an array, it is:

const detailsOfCurrentNotes = Object.assign([], data.notes);

And shorter syntax is:

const detailsOfCurrentNotes = [...data.notes];

This creates shallow copy of an array.

answered Mar 10 '18 at 13:40

Estus Flask

179,509
61
360
499

And a shallow copy is cleary not what TO is asking for: _"But still `detailsOfCurrentNotes` value changes according to the value of `data.notes`"_ – Andreas Mar 10 '18 at 13:42
@Andreas The question isn't clear enough about the details, so reading OP's thoughts is a bit far-fetched – Estus Flask Mar 10 '18 at 13:44

Need a copy of value. No need referenced value

2 Answers2