whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>({
  1. TResult? directConvoMember(
    1. DirectConvoMember data
    )?,
  2. TResult? groupConvoMember(
    1. GroupConvoMember data
    )?,
  3. TResult? pastGroupConvoMember(
    1. PastGroupConvoMember 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( DirectConvoMember data)?  directConvoMember,TResult? Function( GroupConvoMember data)?  groupConvoMember,TResult? Function( PastGroupConvoMember data)?  pastGroupConvoMember,TResult? Function( Map<String, dynamic> data)?  unknown,}) {final _that = this;
switch (_that) {
case UProfileViewBasicKindDirectConvoMember() when directConvoMember != null:
return directConvoMember(_that.data);case UProfileViewBasicKindGroupConvoMember() when groupConvoMember != null:
return groupConvoMember(_that.data);case UProfileViewBasicKindPastGroupConvoMember() when pastGroupConvoMember != null:
return pastGroupConvoMember(_that.data);case UProfileViewBasicKindUnknown() when unknown != null:
return unknown(_that.data);case _:
  return null;

}
}