Flutter - replacing an item in a list

Question

I have this list of int which has a length of 3

This is the list:

List<Tamount> integer= [
 amount(amount: 2, id: '34'),
 amount(amount: 4, id: '12'),
 TotalAmount(amount: 2, id: '54'),
];

And I want to replace index 2 so the one with the amount of 4

I have tried this :

integer.isNotEmpty
  ? integer.remove(integer[1].id)
  : null;
integers.insert(1, integer(
  id: DateTime.now().toString(),
  amount:34,
));

But it is not working ,for some reason it is not removing it from the list, but it is adding to the list.

Answer 1

If you know the index of the element you want to replace, you don't need to remove existing element from the List. You can assign the new element by index.

  integer[1] = amount(amount: 5, id: 'new_id');

Answer 2

You can do this:

integer.isNotEmpty
  ? integer.removeWhere((item)=>item.amount == 4) //removes the item where the amount is 4
  : null;
integers.insert(
  1,
  amount(
    id: DateTime.now().toString(),
    amount:34,
  ));

If you want to remove an item by using the index, you can use removeAt() method:

integer.isNotEmpty
  ? integer.removeAt(1) //removes the item at index 1
  : null;
integers.insert(
  1,
  amount(
    id: DateTime.now().toString(),
    amount:34,
  ));