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 UEmbedRecordViewRecordEmbedsEmbedImagesView() when embedImagesView != null:
return embedImagesView(_that.data);case UEmbedRecordViewRecordEmbedsEmbedVideoView() when embedVideoView != null:
return embedVideoView(_that.data);case UEmbedRecordViewRecordEmbedsEmbedExternalView() when embedExternalView != null:
return embedExternalView(_that.data);case UEmbedRecordViewRecordEmbedsEmbedRecordView() when embedRecordView != null:
return embedRecordView(_that.data);case UEmbedRecordViewRecordEmbedsEmbedRecordWithMediaView() when embedRecordWithMediaView != null:
return embedRecordWithMediaView(_that.data);case UEmbedRecordViewRecordEmbedsUnknown() when unknown != null:
return unknown(_that.data);case _:
  return null;

}
}