whenOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? whenOrNull<TResult extends Object?>({
  1. TResult? create(
    1. Create data
    )?,
  2. TResult? update(
    1. Update data
    )?,
  3. TResult? delete(
    1. Delete 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( Create data)?  create,TResult? Function( Update data)?  update,TResult? Function( Delete data)?  delete,TResult? Function( Map<String, dynamic> data)?  unknown,}) {final _that = this;
switch (_that) {
case URepoApplyWritesWritesCreate() when create != null:
return create(_that.data);case URepoApplyWritesWritesUpdate() when update != null:
return update(_that.data);case URepoApplyWritesWritesDelete() when delete != null:
return delete(_that.data);case URepoApplyWritesWritesUnknown() when unknown != null:
return unknown(_that.data);case _:
  return null;

}
}