whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. bool enabled,
    2. double volume,
    3. bool messageSent,
    4. bool messageReceived,
    5. bool chatOpened,
    6. bool chatClosed,
    7. bool error,
    8. bool buttonClick,
    9. bool notification,
    10. String? messageSentSoundUrl,
    11. String? messageReceivedSoundUrl,
    12. String? notificationSoundUrl,
    13. String? errorSoundUrl,
    )?
)

A variant of when that fallback to returning null

It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? Function( bool enabled,  double volume,  bool messageSent,  bool messageReceived,  bool chatOpened,  bool chatClosed,  bool error,  bool buttonClick,  bool notification,  String? messageSentSoundUrl,  String? messageReceivedSoundUrl,  String? notificationSoundUrl,  String? errorSoundUrl)?  $default,) {final _that = this;
switch (_that) {
case _SoundConfiguration() when $default != null:
return $default(_that.enabled,_that.volume,_that.messageSent,_that.messageReceived,_that.chatOpened,_that.chatClosed,_that.error,_that.buttonClick,_that.notification,_that.messageSentSoundUrl,_that.messageReceivedSoundUrl,_that.notificationSoundUrl,_that.errorSoundUrl);case _:
  return null;

}
}