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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> Object.freeze;
function freeze() { [native code for Object.freeze, arity=1] }

js> [undefined, null, true, 1, 'hello'].forEach(function(value) { 
  >   expectTypeError(function() { Object.freeze(value) }) 
  > })
js> expectTypeError(function() { Object.freeze() })

js> var x = {}
js> var y = Object.freeze(x)
js> x === y
true

js> var obj = Object.defineProperty({}, 'a', {configurable:true, writable:true})
js> var _ = Object.freeze(obj)
js> var a = Object.getOwnPropertyDescriptor(obj, 'a');
js> a.configurable
false
js> a.writable
false
js> Object.isExtensible(obj)
false

js> Object.isFrozen(obj)
true

js> var _ = Object.freeze([])
js> var _ = Object.freeze({})
js> var _ = Object.freeze(function(){})
js> var _ = Object.freeze(/a/)
js> var _ = Object.freeze(RegExp)