mapOrNull<TResult extends Object?> method

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

}
}