ES6 computed property names

test/mjsunit/harmony/computed-property-names-object-literals-methods.js

+// Copyright 2014 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-computed-property-names --harmony-object-literals
+
+
+function ID(x) {
+  return x;
+}
+
+
+(function TestMethodComputedNameString() {
+  var object = {
+    a() { return 'A'},
+    ['b']() { return 'B'; },
+    c() { return 'C'; },
+    [ID('d')]() { return 'D'; },
+  };
+  assertEquals('A', object.a());
+  assertEquals('B', object.b());
+  assertEquals('C', object.c());
+  assertEquals('D', object.d());
+  assertArrayEquals(['a', 'b', 'c', 'd'], Object.keys(object));
+})();
+
+
+(function TestMethodComputedNameNumber() {
+  var object = {
+    a() { return 'A'; },
+    [1]() { return 'B'; },
+    c() { return 'C'; },
+    [ID(2)]() { return 'D'; },
+  };
+  assertEquals('A', object.a());
+  assertEquals('B', object[1]());
+  assertEquals('C', object.c());
+  assertEquals('D', object[2]());
+  // Array indexes first.
+  assertArrayEquals(['1', '2', 'a', 'c'], Object.keys(object));
+})();
+
+
+(function TestMethodComputedNameSymbol() {
+  var sym1 = Symbol();
+  var sym2 = Symbol();
+  var object = {
+    a() { return 'A'; },
+    [sym1]() { return 'B'; },
+    c() { return 'C'; },
+    [ID(sym2)]() { return 'D'; },
+  };
+  assertEquals('A', object.a());
+  assertEquals('B', object[sym1]());
+  assertEquals('C', object.c());
+  assertEquals('D', object[sym2]());
+  assertArrayEquals(['a', 'c'], Object.keys(object));
+  assertArrayEquals([sym1, sym2], Object.getOwnPropertySymbols(object));
+})();
+
+
+function assertIteratorResult(value, done, result) {
+  assertEquals({ value: value, done: done}, result);
+}
+
+
+(function TestGeneratorComputedName() {
+  var object = {
+    *['a']() {
+      yield 1;
+      yield 2;
+    }
+  };
+  var iter = object.a();
+  assertIteratorResult(1, false, iter.next());
+  assertIteratorResult(2, false, iter.next());
+  assertIteratorResult(undefined, true, iter.next());
+  assertArrayEquals(['a'], Object.keys(object));
+})();
+
+
+(function TestToNameSideEffects() {
+  var counter = 0;
+  var key1 = {
+    toString: function() {
+      assertEquals(0, counter++);
+      return 'b';
+    }
+  };
+  var key2 = {
+    toString: function() {
+      assertEquals(1, counter++);
+      return 'd';
+    }
+  };
+  var object = {
+    a() { return 'A'; },
+    [key1]() { return 'B'; },
+    c() { return 'C'; },
+    [key2]() { return 'D'; },
+  };
+  assertEquals(2, counter);
+  assertEquals('A', object.a());
+  assertEquals('B', object.b());
+  assertEquals('C', object.c());
+  assertEquals('D', object.d());
+  assertArrayEquals(['a', 'b', 'c', 'd'], Object.keys(object));
+})();
+
+
+(function TestDuplicateKeys() {
+  'use strict';
+  // ES5 does not allow duplicate keys.
+  // ES6 does but we haven't changed our code yet.
+
+  var object = {
+    a() { return 1; },
+    ['a']() { return 2; },
+  };
+  assertEquals(2, object.a());
+})();