whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String type,
    2. String data
    )?, {
  2. TResult? arr(
    1. String type,
    2. List<String> data
    )?,
  3. TResult? any(
    1. String type,
    2. dynamic data
    )?,
})

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(@JsonKey(name: 'type') String type,
          @JsonKey(name: 'data') String data)?
      $default, {
  TResult? Function(@JsonKey(name: 'type') String type,
          @JsonKey(name: 'data') List<String> data)?
      arr,
  TResult? Function(@JsonKey(name: 'type') String type,
          @JsonKey(name: 'data') dynamic data)?
      any,
}) {
  final _that = this;
  switch (_that) {
    case PublicSendModelDefault() when $default != null:
      return $default(_that.type, _that.data);
    case PublicSendModelArr() when arr != null:
      return arr(_that.type, _that.data);
    case PublicSendModelAny() when any != null:
      return any(_that.type, _that.data);
    case _:
      return null;
  }
}