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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> load('testsrc/doctests/util.js')

js> var bom = String.fromCharCode(0xFEFF);
js> eval(bom);
js> var _ = eval("(function(){return"+bom+"1;})");
js> expectError(function() {
  >   eval("i"+bom+"f (false);");
  > }, SyntaxError);

js> parseInt(bom+"1")
1
js> parseFloat(bom+"1.5");
1.5
js> (bom+"abc"+bom).trim().length
3
js> /\s/.test(bom)
true
js> (bom+"1"+bom) * 1
1