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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.getOwnPropertyDescriptor;
function getOwnPropertyDescriptor() { [native code for Object.getOwnPropertyDescriptor, arity=2] }

js> expectTypeError(function() { Object.getOwnPropertyDescriptor() })

js> var desc = Object.getOwnPropertyDescriptor({undefined:3});
js> desc.value
3
js> [undefined, null, true, 1, 'hello'].forEach(function(value) { 
  >   expectTypeError(function() { Object.getOwnPropertyDescriptor(value, 'p') }) 
  > })

js> Object.getOwnPropertyDescriptor({}, 'p') === undefined;
true

js> var desc = Object.getOwnPropertyDescriptor({p:1}, 'p');
js> desc.value
1
js> desc.writable
true
js> desc.enumerable
true
js> desc.configurable
true

js> var desc = Object.getOwnPropertyDescriptor({ get p() {}, set p() {} }, 'p');
js> desc.value === undefined;
true
js> desc.writable === undefined;
true
js> desc.get.toSource()
(function () {})
js> desc.set.toSource()
(function () {})
js> desc.enumerable
true
js> desc.configurable
true

js> desc.__proto__ === Object.prototype
true
js> desc.__parent__;
[object global]

js> var func = function(){}
js> func.a = 1; Object.getOwnPropertyDescriptor(func, 'a').toSource()
({value:1, writable:true, enumerable:true, configurable:true})

js> Object.getOwnPropertyDescriptor({undefined: 1}, undefined).toSource()
({value:1, writable:true, enumerable:true, configurable:true})

js> Object.getOwnPropertyDescriptor({0:1}, 0).toSource()
({value:1, writable:true, enumerable:true, configurable:true})

js> Object.getOwnPropertyDescriptor([1], 0).toSource()
({value:1, writable:true, enumerable:true, configurable:true})

js> Object.getOwnPropertyDescriptor([1], '0').toSource()
({value:1, writable:true, enumerable:true, configurable:true})

js> Object.getOwnPropertyDescriptor([1], 1) === undefined
true

js> Object.getOwnPropertyDescriptor([1], -1) === undefined
true

js> var arr = []; 
js> arr.a = 1;
1
js> Object.getOwnPropertyDescriptor(arr, 'a').toSource()
({value:1, writable:true, enumerable:true, configurable:true})

js> var arr = Object.defineProperty([], 'a', {value:1, writable:false,})
js> var desc = Object.getOwnPropertyDescriptor(arr, 'a'); ([desc.value, desc.writable]).toSource()
[1, false]