whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>(
  1. TResult? $default(
    1. Map<String, dynamic> slangJson,
    2. Map<String, dynamic> slangScopedJson,
    3. Map<String, dynamic> baseSlangJson,
    4. Map<String, dynamic> ovSlangJson,
    5. Set<String> scopedKeys,
    6. List<String> diffKeys,
    7. String? selectedKey,
    8. String? scrollToKey,
    9. bool disablePreviewFocus,
    10. List<String> searchResults,
    11. double progress,
    )?
)

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(
          Map<String, dynamic> slangJson,
          Map<String, dynamic> slangScopedJson,
          Map<String, dynamic> baseSlangJson,
          Map<String, dynamic> ovSlangJson,
          Set<String> scopedKeys,
          List<String> diffKeys,
          String? selectedKey,
          String? scrollToKey,
          bool disablePreviewFocus,
          List<String> searchResults,
          double progress)?
      $default,
) {
  final _that = this;
  switch (_that) {
    case _SlangEditorState() when $default != null:
      return $default(
          _that.slangJson,
          _that.slangScopedJson,
          _that.baseSlangJson,
          _that.ovSlangJson,
          _that.scopedKeys,
          _that.diffKeys,
          _that.selectedKey,
          _that.scrollToKey,
          _that.disablePreviewFocus,
          _that.searchResults,
          _that.progress);
    case _:
      return null;
  }
}