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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.

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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

js> function primBeget(proto) {
  >   if (proto === null) { fail("Cannot beget from null."); }
  >   if (proto === (void 0)) { fail("Cannot beget from undefined."); }
  >   function F() {}
  >   F.prototype = proto;
  >   var result = new F();
  >   return result;
  > }
js> var x = [1].concat(primBeget(Array.prototype));
js> x
1,
js> x[1]

js> typeof x[1]
object
js> x[1] instanceof Array
true