whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>({
  1. TResult? embedImagesView(
    1. EmbedImagesView data
    )?,
  2. TResult? embedVideoView(
    1. EmbedVideoView data
    )?,
  3. TResult? embedExternalView(
    1. EmbedExternalView data
    )?,
  4. TResult? embedRecordView(
    1. EmbedRecordView data
    )?,
  5. TResult? embedRecordWithMediaView(
    1. EmbedRecordWithMediaView data
    )?,
  6. TResult? unknown(
    1. Map<String, 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( EmbedImagesView data)?  embedImagesView,TResult? Function( EmbedVideoView data)?  embedVideoView,TResult? Function( EmbedExternalView data)?  embedExternalView,TResult? Function( EmbedRecordView data)?  embedRecordView,TResult? Function( EmbedRecordWithMediaView data)?  embedRecordWithMediaView,TResult? Function( Map<String, dynamic> data)?  unknown,}) {final _that = this;
switch (_that) {
case UPostViewEmbedEmbedImagesView() when embedImagesView != null:
return embedImagesView(_that.data);case UPostViewEmbedEmbedVideoView() when embedVideoView != null:
return embedVideoView(_that.data);case UPostViewEmbedEmbedExternalView() when embedExternalView != null:
return embedExternalView(_that.data);case UPostViewEmbedEmbedRecordView() when embedRecordView != null:
return embedRecordView(_that.data);case UPostViewEmbedEmbedRecordWithMediaView() when embedRecordWithMediaView != null:
return embedRecordWithMediaView(_that.data);case UPostViewEmbedUnknown() when unknown != null:
return unknown(_that.data);case _:
  return null;

}
}