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? 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( Map<String, dynamic> data)?  unknown,}) {final _that = this;
switch (_that) {
case UEmbedRecordWithMediaViewMediaEmbedImagesView() when embedImagesView != null:
return embedImagesView(_that.data);case UEmbedRecordWithMediaViewMediaEmbedVideoView() when embedVideoView != null:
return embedVideoView(_that.data);case UEmbedRecordWithMediaViewMediaEmbedExternalView() when embedExternalView != null:
return embedExternalView(_that.data);case UEmbedRecordWithMediaViewMediaUnknown() when unknown != null:
return unknown(_that.data);case _:
  return null;

}
}