Dart

conditional item in the list

Nice and clean

  final foo = [
    "foo",
    if (_flag)  "bar",
  ]

.. operator

Assuming you are chaining functions as

foo().bar().baz()

but unfortunately baz is returning void but you need same type as returned by bar. You can use .. instead of having temporary variable.

foo().bar()..baz() // chain returns object returned by bar