code: @Override
      public void delete(final String varName) {
          runWithContext(new RhinoCallable<Void, RuntimeException>() {
              @Override
              protected Void doCall(Context cx, Scriptable scope) {
                  scope.delete(varName);
                  return null;
              }
          });
      }
docs: /* (non-Javadoc)
  @see minium.script.rhinojs.JsEngine#delete(java.lang.String)