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? embedRecord(
    1. EmbedRecord data
    )?,
  5. TResult? embedRecordWithMedia(
    1. EmbedRecordWithMedia 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( EmbedImages data)?  embedImages,TResult? Function( EmbedVideo data)?  embedVideo,TResult? Function( EmbedExternal data)?  embedExternal,TResult? Function( EmbedRecord data)?  embedRecord,TResult? Function( EmbedRecordWithMedia data)?  embedRecordWithMedia,TResult? Function( Map<String, dynamic> data)?  unknown,}) {final _that = this;
switch (_that) {
case UFeedPostEmbedEmbedImages() when embedImages != null:
return embedImages(_that.data);case UFeedPostEmbedEmbedVideo() when embedVideo != null:
return embedVideo(_that.data);case UFeedPostEmbedEmbedExternal() when embedExternal != null:
return embedExternal(_that.data);case UFeedPostEmbedEmbedRecord() when embedRecord != null:
return embedRecord(_that.data);case UFeedPostEmbedEmbedRecordWithMedia() when embedRecordWithMedia != null:
return embedRecordWithMedia(_that.data);case UFeedPostEmbedUnknown() when unknown != null:
return unknown(_that.data);case _:
  return null;

}
}