Flutter remove item from List of maps read-only error

Question

I want to remove an item from my list in a ListView.builder but it's saying it's read only.

List<Map> entries = [{'date': '2019-08-10', 'data': 85.0}, {'date': '2019-08-14', 'data': 84.0}];

onPressed: () {
  removeItem(index);
}

void removeItem(index) {
  entries.removeAt(index);
}

Another exception was thrown: Unsupported operation: read-only

This does not work either:

onPressed: () {
  removeItem(date);
}

void removeItem(date) {
  entries.removeWhere((item) => item['date'] == date);
}

If you change List<Map> to something else say List<int> entries = [1,2], do you still get the error? — CopsOnRoad
– CopsOnRoad, Commented Aug 14, 2019 at 12:17
@CopsOnRoad It seems not, no error if it's just a list of ints. — Hasen
– Hasen, Commented Aug 14, 2019 at 12:22

balaji b r k · Accepted Answer · 2020-10-17 19:27:45Z

5

I got the solution from this, the link

entries = List.from(entries)..removeAt("theIndexValue");

answered Oct 17, 2020 at 19:27

balaji b r k

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Ricardo Alexis Huerta Salazar · Accepted Answer · 2024-08-31 05:29:39Z

0

Instead of updating the list, you can generate a new list with the where or the whereNot methods, something like this:

List<Map> updatedEntries = entries.whereNot((item) => item['date'] == date);

answered Aug 31, 2024 at 5:29

Ricardo Alexis Huerta Salazar

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