Method modify

rhino/src/main/java/org/mozilla/javascript/SlotMap.java:48–48

Return the Slot that matches EITHER "key" or "index". (It will use "key" if it is not null, and otherwise "index".) If no slot exists, then create a default slot class. @param key The key for the slot, which should be a String or a Symbol. @param index if key is zero, then this will be used as the

(SlotMapOwner<T> owner, Object key, int index, int attributes)

     * @return a Slot, which will be created anew if no such slot exists.
     */
    Slot<T> modify(SlotMapOwner<T> owner, Object key, int index, int attributes);

    /**
     * Retrieve the slot at EITHER key or index, or return null if the slot cannot be found.