Override ArrayDeque.head to avoid iterator allocation

retronym · Oct 23, 2019 · 093d26a · 093d26a
1 parent 41964e4
commit 093d26a
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/library/scala/collection/mutable/ArrayDeque.scala b/src/library/scala/collection/mutable/ArrayDeque.scala
@@ -88,6 +88,8 @@ class ArrayDeque[A] protected (
     prependAssumingCapacity(elem)
   }
 
+  override def head: A = apply(0)
+
   @inline private[ArrayDeque] def appendAssumingCapacity(elem: A): this.type = {
     array(end) = elem.asInstanceOf[AnyRef]
     end = end_+(1)