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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=782363

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

function f1() { const a = 0; a++; return a; }
function f2() { const a = 0; ++a; return a; }
function f3() { const a = 0; return a++; }
function f4() { const a = 0; return ++a; }
function f5() { const a = 0; a--; return a; }
function f6() { const a = 0; --a; return a; }
function f7() { const a = 0; return a--; }
function f8() { const a = 0; return --a; }

var called = 0;
var obj = {valueOf: function(){ called += 1; return 0 }};
function g1() { const a = obj; a++; return a; }
function g2() { const a = obj; ++a; return a; }
function g3() { const a = obj; return a++; }
function g4() { const a = obj; return ++a; }
function g5() { const a = obj; a--; return a; }
function g6() { const a = obj; --a; return a; }
function g7() { const a = obj; return a--; }
function g8() { const a = obj; return --a; }

assertSame(0, f1());
assertSame(0, f2());
assertSame(0, f3());
assertSame(1, f4());
assertSame(0, f5());
assertSame(0, f6());
assertSame(0, f7());
assertSame(-1, f8());

assertSame(obj, g1());
assertSame(obj, g2());
assertSame(obj, g3());
assertSame(1, g4());
assertSame(obj, g5());
assertSame(obj, g6());
assertSame(obj, g7());
assertSame(-1, g8());

assertSame(8, called);

"success";