mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? embedExternalViewArticle(
    1. UEmbedGetEmbedExternalViewDataEmbedExternalViewArticle value
    )?,
  2. TResult? embedExternalViewArticlePublication(
    1. UEmbedGetEmbedExternalViewDataEmbedExternalViewArticlePublication value
    )?,
  3. TResult? embedExternalViewGallery(
    1. UEmbedGetEmbedExternalViewDataEmbedExternalViewGallery value
    )?,
  4. TResult? embedExternalViewLivestream(
    1. UEmbedGetEmbedExternalViewDataEmbedExternalViewLivestream value
    )?,
  5. TResult? unknown(
    1. UEmbedGetEmbedExternalViewDataUnknown value
    )?,
})

A variant of map that fallback to returning null.

It is equivalent to doing:

switch (sealedClass) {
  case final Subclass value:
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs TResult? mapOrNull<TResult extends Object?>({TResult? Function( UEmbedGetEmbedExternalViewDataEmbedExternalViewArticle value)?  embedExternalViewArticle,TResult? Function( UEmbedGetEmbedExternalViewDataEmbedExternalViewArticlePublication value)?  embedExternalViewArticlePublication,TResult? Function( UEmbedGetEmbedExternalViewDataEmbedExternalViewGallery value)?  embedExternalViewGallery,TResult? Function( UEmbedGetEmbedExternalViewDataEmbedExternalViewLivestream value)?  embedExternalViewLivestream,TResult? Function( UEmbedGetEmbedExternalViewDataUnknown value)?  unknown,}){
final _that = this;
switch (_that) {
case UEmbedGetEmbedExternalViewDataEmbedExternalViewArticle() when embedExternalViewArticle != null:
return embedExternalViewArticle(_that);case UEmbedGetEmbedExternalViewDataEmbedExternalViewArticlePublication() when embedExternalViewArticlePublication != null:
return embedExternalViewArticlePublication(_that);case UEmbedGetEmbedExternalViewDataEmbedExternalViewGallery() when embedExternalViewGallery != null:
return embedExternalViewGallery(_that);case UEmbedGetEmbedExternalViewDataEmbedExternalViewLivestream() when embedExternalViewLivestream != null:
return embedExternalViewLivestream(_that);case UEmbedGetEmbedExternalViewDataUnknown() when unknown != null:
return unknown(_that);case _:
  return null;

}
}