first property Null safety
Returns the first element.
Throws a StateError if this is empty.
Otherwise returns the first element in the iteration order,
equivalent to this.elementAt(0).
Implementation
@override
E get first => _values.first;Returns the first element.
Throws a StateError if this is empty.
Otherwise returns the first element in the iteration order,
equivalent to this.elementAt(0).
@override
E get first => _values.first;