whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>({
  1. TResult? embedImages(
    1. EmbedImages data
    )?,
  2. TResult? embedVideo(
    1. EmbedVideo data
    )?,
  3. TResult? embedExternal(
    1. EmbedExternal 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( EmbedImages data)?  embedImages,TResult? Function( EmbedVideo data)?  embedVideo,TResult? Function( EmbedExternal data)?  embedExternal,TResult? Function( Map<String, dynamic> data)?  unknown,}) {final _that = this;
switch (_that) {
case UEmbedRecordWithMediaMediaEmbedImages() when embedImages != null:
return embedImages(_that.data);case UEmbedRecordWithMediaMediaEmbedVideo() when embedVideo != null:
return embedVideo(_that.data);case UEmbedRecordWithMediaMediaEmbedExternal() when embedExternal != null:
return embedExternal(_that.data);case UEmbedRecordWithMediaMediaUnknown() when unknown != null:
return unknown(_that.data);case _:
  return null;

}
}