whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. String? id,
    2. String? iconUrl,
    3. String? iconTitle,
    4. String? iconDescription,
    )?
)

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: 'id') String? id,
          @JsonKey(name: 'url') String? iconUrl,
          @JsonKey(name: 'title') String? iconTitle,
          @JsonKey(name: 'description') String? iconDescription)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _NavigationIcon() when $default != null:
      return $default(
          _that.id, _that.iconUrl, _that.iconTitle, _that.iconDescription);
    case _:
      return null;
  }
}