Removes and returns the first element of this queue.
The queue must not be empty when this method is called.
E removeFirst() { _DoubleLinkedQueueEntry<E> firstEntry = _sentinel._nextLink; E result = firstEntry._remove(); _elementCount--; return result; }
© 2012 the Dart project authors
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https://api.dartlang.org/stable/2.0.0/dart-collection/DoubleLinkedQueue/removeFirst.html