UniqueList<E>.strict constructor
UniqueList<E>.strict ()
Creates a new UniqueList that throws DuplicateValueErrors if a value is added to the list already exists in the list.
If length is provided, a fixed-length list will be created, otherwise
a growable list will be created. Note: To create a growable, strict
and non-nullable list, use UniqueList.empty and set the strict and
nullable parameters to true
and false
respectively.
Implementation
factory UniqueList.strict() =>
UniqueList._(<E>[], strict: true, growable: true);