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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> version(170)
0
js> var foo = {
  >   __iterator__ : function(onlyKeys) {
  >     print(onlyKeys);
  >     yield [0, "a"];
  >   }
  > };
js> for each (let f in foo) {}
false
js> for (let f in foo) {}
true