[es7] implement Object.values() / Object.entries() proposal

test/mjsunit/harmony/object-entries.js

+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-object-values-entries --harmony-proxies --harmony-reflect
+
+function TestMeta() {
+  assertEquals(1, Object.entries.length);
+  assertEquals(Function.prototype, Object.getPrototypeOf(Object.entries));
+}
+TestMeta();
+
+
+function TestBasic() {
+  var x = 16;
+  var O = {
+    d: 1,
+    c: 3,
+    [Symbol.iterator]: void 0,
+    0: 123,
+    1000: 456,
+    [x * x]: "ducks",
+    [`0x${(x * x).toString(16)}`]: "quack"
+  };
+  O.a = 2;
+  O.b = 4;
+  Object.defineProperty(O, "HIDDEN", { enumerable: false, value: NaN });
+  assertEquals([
+    ["0", 123],
+    ["256", "ducks"],
+    ["1000", 456],
+    ["d", 1],
+    ["c", 3],
+    ["0x100", "quack"],
+    ["a", 2],
+    ["b", 4]
+  ], Object.entries(O));
+  assertEquals(Object.entries(O), Object.keys(O).map(key => [key, O[key]]));
+}
+TestBasic();
+
+
+function TestOrder() {
+  var O = {
+    a: 1,
+    [Symbol.iterator]: null
+  };
+  O[456] = 123;
+  Object.defineProperty(O, "HIDDEN", { enumerable: false, value: NaN });
+
+  var log = [];
+  var P = new Proxy(O, {
+    ownKeys(target) {
+      log.push("[[OwnPropertyKeys]]");
+      return Reflect.ownKeys(target);
+    },
+    get(target, name) {
+      log.push(`[[Get]](${JSON.stringify(name)})`);
+      return Reflect.get(target, name);
+    },
+    set(target, name, value) {
+      assertUnreachable();
+    }
+  });
+
+  assertEquals([["456", 123], ["a", 1]], Object.entries(P));
+  assertEquals([
+    "[[OwnPropertyKeys]]",
+    "[[Get]](\"456\")",
+    "[[Get]](\"a\")"
+  ], log);
+}
+TestOrder();