mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? embedImagesView(
    1. UPostViewEmbedEmbedImagesView value
    )?,
  2. TResult? embedVideoView(
    1. UPostViewEmbedEmbedVideoView value
    )?,
  3. TResult? embedExternalView(
    1. UPostViewEmbedEmbedExternalView value
    )?,
  4. TResult? embedRecordView(
    1. UPostViewEmbedEmbedRecordView value
    )?,
  5. TResult? embedRecordWithMediaView(
    1. UPostViewEmbedEmbedRecordWithMediaView value
    )?,
  6. TResult? unknown(
    1. UPostViewEmbedUnknown 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( UPostViewEmbedEmbedImagesView value)?  embedImagesView,TResult? Function( UPostViewEmbedEmbedVideoView value)?  embedVideoView,TResult? Function( UPostViewEmbedEmbedExternalView value)?  embedExternalView,TResult? Function( UPostViewEmbedEmbedRecordView value)?  embedRecordView,TResult? Function( UPostViewEmbedEmbedRecordWithMediaView value)?  embedRecordWithMediaView,TResult? Function( UPostViewEmbedUnknown value)?  unknown,}){
final _that = this;
switch (_that) {
case UPostViewEmbedEmbedImagesView() when embedImagesView != null:
return embedImagesView(_that);case UPostViewEmbedEmbedVideoView() when embedVideoView != null:
return embedVideoView(_that);case UPostViewEmbedEmbedExternalView() when embedExternalView != null:
return embedExternalView(_that);case UPostViewEmbedEmbedRecordView() when embedRecordView != null:
return embedRecordView(_that);case UPostViewEmbedEmbedRecordWithMediaView() when embedRecordWithMediaView != null:
return embedRecordWithMediaView(_that);case UPostViewEmbedUnknown() when unknown != null:
return unknown(_that);case _:
  return null;

}
}