# lookup method

E lookup (Object object)
override

If an object equal to `object` is in the set, return it.

Checks if there is an object in the set that is equal to `object`. If so, that object is returned, otherwise returns null.

## Implementation

    E lookup(Object object) {
      if (!_validKey(object)) return null;
      int comp = _splay(object);
      if (comp != 0) return null;
      return _root.key;
    }