onTap method Null safety

dynamic onTap(
  1. DialogChoice<T> dialogChoice,
  2. List<DialogChoice<T>> selectedChoices,
  3. Function setState
)

Implementation

onTap(DialogChoice<T> dialogChoice, List<DialogChoice<T>> selectedChoices,
    Function setState) {
  if (selectedChoices.contains(dialogChoice)) {
    selectedChoices.remove(dialogChoice);
  } else {
    selectedChoices.add(dialogChoice);
  }
  setState();
}