whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>({
  1. TResult? richtextFacetMention(
    1. RichtextFacetMention data
    )?,
  2. TResult? richtextFacetLink(
    1. RichtextFacetLink data
    )?,
  3. TResult? richtextFacetTag(
    1. RichtextFacetTag 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( RichtextFacetMention data)?  richtextFacetMention,TResult? Function( RichtextFacetLink data)?  richtextFacetLink,TResult? Function( RichtextFacetTag data)?  richtextFacetTag,TResult? Function( Map<String, dynamic> data)?  unknown,}) {final _that = this;
switch (_that) {
case URichtextFacetFeaturesRichtextFacetMention() when richtextFacetMention != null:
return richtextFacetMention(_that.data);case URichtextFacetFeaturesRichtextFacetLink() when richtextFacetLink != null:
return richtextFacetLink(_that.data);case URichtextFacetFeaturesRichtextFacetTag() when richtextFacetTag != null:
return richtextFacetTag(_that.data);case URichtextFacetFeaturesUnknown() when unknown != null:
return unknown(_that.data);case _:
  return null;

}
}