iterable-plus-minus-in-dart.dart

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extension AddRemoveItems<T> on Iterable<T> {
  Iterable<T> operator +(T other) => followedBy([other]);
  Iterable<T> operator -(T other) => where((element) => element != other);
}

void testIt() {
  final values = ['foo', 'bar']
    .map((e) => e.toUpperCase()) + 'BAZ';
  values.log(); // (FOO, BAR, BAZ)
  (values - 'BAZ').log(); // (FOO, BAR)
}