singleWhereOrNone method

Option<T> singleWhereOrNone(
  1. bool test(
    1. T element
    )
)

Returns the single element satisfying test as a Some, or None.

Implementation

Option<T> singleWhereOrNone(bool Function(T element) test) {
  late T result;
  var found = false;
  for (final element in this) {
    if (test(element)) {
      if (found) return const None(); // Found more than one
      result = element;
      found = true;
    }
  }
  return found ? Some(result) : const None();
}