src/jdk/nashorn/internal/objects/NativeArray.java

*** 29,38 ****
--- 29,39 ----
  import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
  import static jdk.nashorn.internal.runtime.PropertyDescriptor.VALUE;
  import static jdk.nashorn.internal.runtime.PropertyDescriptor.WRITABLE;
  import static jdk.nashorn.internal.runtime.arrays.ArrayLikeIterator.arrayLikeIterator;
  import static jdk.nashorn.internal.runtime.arrays.ArrayLikeIterator.reverseArrayLikeIterator;
+ import static jdk.nashorn.internal.runtime.arrays.ArrayIndex.isValidArrayIndex;
  
  import java.lang.invoke.MethodHandle;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collections;
*** 348,357 ****
--- 349,379 ----
          // not an index property
          return super.defineOwnProperty(key, desc, reject);
      }
  
      /**
+      * Spec. mentions use of [[DefineOwnProperty]] for indexed properties in
+      * certain places (eg. Array.prototype.map, filter). We can not use ScriptObject.set
+      * method in such cases. This is because set method uses inherited setters (if any)
+      * from any object in proto chain such as Array.prototype, Object.prototype.
+      * This method directly sets a particular element value in the current object.
+      *
+      * @param index key for property
+      * @param value value to define
+      */
+     @Override
+     public final void defineOwnProperty(final int index, final Object value) {
+         assert isValidArrayIndex(index) : "invalid array index";
+         final long longIndex = ArrayIndex.toLongIndex(index);
+         if (longIndex >= getArray().length()) {
+             // make array big enough to hold..
+             setArray(getArray().ensure(longIndex));
+         }
+         setArray(getArray().set(index, value, false));
+     }
+ 
+     /**
       * Return the array contents upcasted as an ObjectArray, regardless of
       * representation
       *
       * @return an object array
       */