Implemented Object.keys.

test/mjsunit/third_party/object-keys.js

+// Copyright (c) 2006 Apple Computer, Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+//
+// 1. Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided
+// with the distribution.
+//
+// 3. Neither the name of the copyright holder(s) nor the names of any
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+// OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Based on LayoutTests/fast/js/Object-keys.html
+
+assertThrows(function () { Object.keys(2) }, TypeError);
+assertThrows(function () { Object.keys("foo") }, TypeError);
+assertThrows(function () { Object.keys(null) }, TypeError);
+assertThrows(function () { Object.keys(undefined) }, TypeError);
+
+assertEquals(Object.keys({}), []);
+assertEquals(Object.keys({a:null}), ['a']);
+assertEquals(Object.keys({a:null, b:null}), ['a', 'b']);
+assertEquals(Object.keys({b:null, a:null}), ['b', 'a']);
+assertEquals(Object.keys([]), []);
+assertEquals(Object.keys([null]), ['0']);
+assertEquals(Object.keys([null,null]), ['0', '1']);
+assertEquals(Object.keys([null,null,,,,null]), ['0', '1', '5']);
+assertEquals(Object.keys({__proto__:{a:null}}), []);
+assertEquals(Object.keys({__proto__:[1,2,3]}), []);
+var x = [];
+x.__proto__ = [1, 2, 3];
+assertEquals(Object.keys(x), []);
+
+function argsTest(a, b, c) {
+  assertEquals([], Object.keys(arguments));
+}
+
+argsTest(1, 2, 3);
+
+var literal = {a: 1, b: 2, c: 3};
+var keysBefore = Object.keys(literal);
+assertEquals(['a', 'b', 'c'], keysBefore);
+keysBefore[0] = 'x';
+var keysAfter = Object.keys(literal);
+assertEquals(['a', 'b', 'c'], keysAfter);
+assertEquals(['x', 'b', 'c'], keysBefore);