first property
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 {
if (isEmpty) {
throw IllegalStateException('No element');
}
// Create a new iterator and move to the first element
final iter = iterator;
iter.moveNext();
return iter.current;
}