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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/.

// Test of  Creating a JavaScript Iterator from a Java Iterable or Iterator
// See http://developer.mozilla.org/en/docs/New_in_Rhino_1.7R1
js> m = new java.util.LinkedHashMap()
{}
js> m.put("a",1); m.put("b",2); m
{a=1.0, b=2.0}
js> for (i in Iterator(m.values())) print(i)
1.0
2.0
js> for (i in Iterator(m.values().iterator())) print(i)
1.0
2.0