How to stop Dart's .forEach()?

Question

List data = [1, 2, 3];
data.forEach((value) {
  if (value == 2) {
    // how to stop?
  }
  print(value);
});

Answer 1

The callback that forEach takes returns void so there is no mechanism to stop iteration.

In this case you should be using iterators:

void listIteration() {
  List data = [1,2,3];

  Iterator i = data.iterator;

  while (i.moveNext()) {
    var e = i.current;
    print('$e');
    if (e == 2) {
      break;
    }
  }
}