How to remove item from list and return new list without removed item in flutter

Question

I have a list of string as List<String> temp = ['a', 'b', 'c', 'd']; I want to modify and remove specific item from the list and return new list without the removed item.

For example, if I want to remove index 2, what I want to get is ['a', 'b', 'd'] removeAt doesn't work since it just returns removed string item...

Answer 1

You can use cascade notation to return the list when you call removeAt.

void main() {
  print(['a', 'b', 'c', 'd']..removeAt(2));
}

Answer 2

temp.removeAt(index); is exactly what you want.

void main() {
  List<String> temp = ['a', 'b', 'c', 'd'];
  temp.removeAt(2);
  print(temp);
}

this function prints ['a', 'b', 'd'] which is what you wanted to get right?

but if you can also get the removed value with this.

void main() {
  List<String> temp = ['a', 'b', 'c', 'd'];
  var removedValue = temp.removeAt(2);
  print(removedValue);
}

If what you want is to get a clone of the original list but without the element you can create a new one like this.

  void main() {
  List<String> temp = ['a', 'b', 'c', 'd'];
  int indexToRemove = 2;
  List newList = temp.where((x) => temp.indexOf(x) != indexToRemove).toList();
  print(newList);
}