How to duplicate object in react - reactjs

Question

Even replicating the object succeeded. However, the id value is duplicated the same. Therefore, if you click the delete button, the deletion will be done together.But I want to get a different ID. How can I fix it here?
const handleduplicate = id => {
const dupDataGroup = [...Groupdata].filter(item => item.id === id);
const newGroup = [dupDataGroup[0], ...Groupdata];
setGroupData(newGroup);
};
The result when I didn't do anything =>
0: {id: 0, title: 'blur', subtitle: 'Img'}
1: {id: 1, title: 'blurs', subtitle: 'Ima'}
2: {id: 2, title: 'Free ', subtitle: 'Ima'}
handleduplicate click result=>
0: {**id: 0**, title: 'blur', subtitle: 'Img'}
1: {**id: 0,** title: 'blur', subtitle: 'Img'}
2: {id: 1, title: 'blurs', subtitle: 'Ima'}
3: {id: 2, title: 'Free ', subtitle: 'Ima'}
I hope that only the ID value will change when duplicated.

Answer 1

React does not automatically update the key index in JSON objects. Also, in this scenario, you're fetching the value and inserting it into the newGroup.
If you really want to update the keys, I'd suggest creating a for loop to update the values of id.
const handleduplicate = id => {
const dupDataGroup = [...Groupdata].filter(item => item.id === id);
const newGroup = [dupDataGroup[0], ...Groupdata];
for (var i = 0; i < newGroup.length; i++)
newGroup[i].id = i;
setGroupData(newGroup);
};

Answer 2

You can duplicate an object by using the spread operator.
const obj = {name: 'ritik', surname: 'banger'};
const objCopy = {...obj};
or use of Object.assign will work for you.
let objcopy = Object.assign({}, obj);
You must note that here we are referencing the original object 'obj' and thus any changes in 'objcopy' will reflect in 'obj', this is known as shallow copy.
If you want to deep copy the object and you wish to have different reference for both then,
Using JQuery library:
import jQ from "jquery";
let objcopy = jQ.extend(true, obj, {});
Using lodash library:
var objects = [{ 'a': 1 }, { 'b': 2 }];
var deep = _.cloneDeep(objects);
console.log(deep[0] === objects[0]);
// => false

Answer 3

[...Groupdata] creates a new list with the (non-duplicated) items in Groupdata. This is important if you'd want to add the item twice to the list, as changing one with change the same object as you already noticed. You will also have to duplicate the item itself.
Note that duplicating the list itself isn't necessary if you're just going to filter on it.
What I also think is happening, given the additional information in the comments, is that setGroupData is used multiple times. If you use Groupdata, followed by setGroupData, then Groupdata is not updated accordingly. So just make sure you use that function once.
const handleduplicate = (groupData, id, newId) => {
const dupDataGroup = groupData.filter(item => item.id === id); // no copying here.
const rest = groupData.filter(item => item.id !== id);
const newGroup = [
{ // the item is duplicated (note: no deep copy)
...dupDataGroup[0],
id: newId // updated with the new identifier
},
...rest
];
return newGroup;
};
const duplicated = handleduplicate(Groupdata, 123, 456);
setGroupData(duplicated);