first property
      
      dynamic
      get
      first
      
    
inherited
    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
E get first {
  Iterator<E> it = iterator;
  if (!it.moveNext()) {
    throw IterableElementError.noElement();
  }
  return it.current;
}