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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/.

// https://bugzilla.mozilla.org/show_bug.cgi?id=778549

function assertSame(expected, actual) {
  if (expected !== actual) {
    throw "Expected '" + expected + "' but was '" + actual + "'";
  }
}

function assertTrue(actual) {
  assertSame(true, actual);
}

function assertFalse(actual) {
  assertSame(false, actual);
}


var array = ['a',,void 0];

assertSame(3, array.length);
assertTrue(array.hasOwnProperty('0'));
assertFalse(array.hasOwnProperty('1'));
assertTrue(array.hasOwnProperty('2'));

array.sort();

assertSame(3, array.length);
assertTrue(array.hasOwnProperty('0'));
assertTrue(array.hasOwnProperty('1'));
assertFalse(array.hasOwnProperty('2'));

"success";