i need to copy array of objects without reference. I tried
newarr = arr.slice();
newarr = [...arr]];
But both of them have reference to object so when i change them in newarr it changes in arr aswell.
Asked
Active
Viewed 248 times
0
-
1`newarr = arr.map(obj => ({...obj}))` – Federkun Oct 14 '18 at 23:09
-
2Possible duplicate of [What is the most efficient way to deep clone an object in JavaScript?](https://stackoverflow.com/questions/122102/what-is-the-most-efficient-way-to-deep-clone-an-object-in-javascript) – Spencer Wieczorek Oct 14 '18 at 23:10
-
newarr = arr.map(obj => ({...obj})) works, do you know performace of this method? – Jirka Kastan Oct 14 '18 at 23:15
-
@JirkaKastan: If they have nested objects, it will not clone them. – SLaks Oct 14 '18 at 23:31
-
`JSON.parse(JSON.stringify(arr));` should work ;) – Nir Alfasi Oct 15 '18 at 00:07
-
1@alfasin This is a good method, although definitely worth mentioning its limitations. Doesn't work if there are circular references, will drop any methods/functions, converts `date`s to `string`s, etc. – Tyler Roper Oct 15 '18 at 01:25