whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>({
  1. TResult? user(
    1. ModerationCauseSourceUser data
    )?,
  2. TResult? list(
    1. ModerationCauseSourceList data
    )?,
  3. TResult? labeler(
    1. ModerationCauseSourceLabeler 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( ModerationCauseSourceUser data)?  user,TResult? Function( ModerationCauseSourceList data)?  list,TResult? Function( ModerationCauseSourceLabeler data)?  labeler,}) {final _that = this;
switch (_that) {
case UModerationCauseSourceUser() when user != null:
return user(_that.data);case UModerationCauseSourceList() when list != null:
return list(_that.data);case UModerationCauseSourceLabeler() when labeler != null:
return labeler(_that.data);case _:
  return null;

}
}