How to copy 2d array of objects?

Question

the objects still changing their value,if something that i losing can you give me an article or the documentation about that, for example:

const array = [
  [
    { local: '5', visit: '6' },
  ],
  [
    { local: '6', visit: '1' },
  ],
  [
    { local: '8', visit: '6' },
  ],
  [
    { local: '6', visit: '2' },
  ],
  [
    { local: '3', visit: '6' },
  ],
  [
    { local: '6', visit: '7' },
  ],
  [
    { local: '4', visit: '6' },
  ]
];

i tried with:

array.map(element => element.slice());

`Array.slice()` makes a shallow copy of the array (i.e. it's items are references to original objects) — comonadd, May 28 '21 at 09:59

score 1 · Answer 1 · answered May 28 '21 at 09:59

1

let copied_array = [...array];

answered May 28 '21 at 09:59

Vivek Bani

3,703
1
9
18

score 1 · Answer 2 · answered May 28 '21 at 09:59

1

To clone an array with objects inside property, you need to perform a deep copy. Probably simplest with:

const newArray = JSON.parse(JSON.stringify(array));

answered May 28 '21 at 09:59

Samuel Olekšák

389
4
12

score 0 · Answer 3 · answered May 28 '21 at 10:01

0

try with this:

const copy = array.map((row) => row.slice().map((object2Copy) => Object.assign({}, object2Copy)));

answered May 28 '21 at 10:01

rodrigo lemus

31
3

How to copy 2d array of objects?

3 Answers3