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)
.
E get first { Iterator<E> it = iterator; if (!it.moveNext()) { throw IterableElementError.noElement(); } return it.current; }
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https://api.dartlang.org/stable/2.0.0/dart-core/Iterable/first.html