whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>({
  1. TResult? embedExternalViewArticle(
    1. EmbedExternalViewArticle data
    )?,
  2. TResult? embedExternalViewArticlePublication(
    1. EmbedExternalViewArticlePublication data
    )?,
  3. TResult? embedExternalViewGallery(
    1. EmbedExternalViewGallery data
    )?,
  4. TResult? embedExternalViewLivestream(
    1. EmbedExternalViewLivestream data
    )?,
  5. 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( EmbedExternalViewArticle data)?  embedExternalViewArticle,TResult? Function( EmbedExternalViewArticlePublication data)?  embedExternalViewArticlePublication,TResult? Function( EmbedExternalViewGallery data)?  embedExternalViewGallery,TResult? Function( EmbedExternalViewLivestream data)?  embedExternalViewLivestream,TResult? Function( Map<String, dynamic> data)?  unknown,}) {final _that = this;
switch (_that) {
case UEmbedGetEmbedExternalViewDataEmbedExternalViewArticle() when embedExternalViewArticle != null:
return embedExternalViewArticle(_that.data);case UEmbedGetEmbedExternalViewDataEmbedExternalViewArticlePublication() when embedExternalViewArticlePublication != null:
return embedExternalViewArticlePublication(_that.data);case UEmbedGetEmbedExternalViewDataEmbedExternalViewGallery() when embedExternalViewGallery != null:
return embedExternalViewGallery(_that.data);case UEmbedGetEmbedExternalViewDataEmbedExternalViewLivestream() when embedExternalViewLivestream != null:
return embedExternalViewLivestream(_that.data);case UEmbedGetEmbedExternalViewDataUnknown() when unknown != null:
return unknown(_that.data);case _:
  return null;

}
}