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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> function Array() { throw "don't call this" }

js> [].length
0
js> [1].length
1
js> [,1,2].length
3
js> [1,,2].length
3
js> [1,2,].length
2
js> [,].length
1
js> [1,,].length
2