src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/arrays/ArrayFilter.java

@@ -66,13 +66,14 @@
     public Object asArrayOfType(final Class<?> componentType) {
         return underlying.asArrayOfType(componentType);
     }
 
     @Override
-    public void shiftLeft(final int by) {
+    public ArrayData shiftLeft(final int by) {
         underlying.shiftLeft(by);
         setLength(underlying.length());
+        return this;
     }
 
     @Override
     public ArrayData shiftRight(final int by) {
         underlying = underlying.shiftRight(by);