ES6 computed property names

test/mjsunit/harmony/computed-property-names-classes.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.
+
+'use strict';
+
+// Flags: --harmony-computed-property-names --harmony-classes
+
+
+function ID(x) {
+  return x;
+}
+
+
+(function TestClassMethodString() {
+  class C {
+    a() { return 'A'}
+    ['b']() { return 'B'; }
+    c() { return 'C'; }
+    [ID('d')]() { return 'D'; }
+  }
+  assertEquals('A', new C().a());
+  assertEquals('B', new C().b());
+  assertEquals('C', new C().c());
+  assertEquals('D', new C().d());
+  assertArrayEquals(['a', 'b', 'c', 'd'], Object.keys(C.prototype));
+})();
+
+
+(function TestClassMethodNumber() {
+  class C {
+    a() { return 'A'; }
+    [1]() { return 'B'; }
+    c() { return 'C'; }
+    [ID(2)]() { return 'D'; }
+  }
+  assertEquals('A', new C().a());
+  assertEquals('B', new C()[1]());
+  assertEquals('C', new C().c());
+  assertEquals('D', new C()[2]());
+  // Array indexes first.
+  assertArrayEquals(['1', '2', 'a', 'c'], Object.keys(C.prototype));
+})();
+
+
+(function TestClassMethodSymbol() {
+  var sym1 = Symbol();
+  var sym2 = Symbol();
+  class C {
+    a() { return 'A'; }
+    [sym1]() { return 'B'; }
+    c() { return 'C'; }
+    [ID(sym2)]() { return 'D'; }
+  }
+  assertEquals('A', new C().a());
+  assertEquals('B', new C()[sym1]());
+  assertEquals('C', new C().c());
+  assertEquals('D', new C()[sym2]());
+  assertArrayEquals(['a', 'c'], Object.keys(C.prototype));
+  assertArrayEquals([sym1, sym2], Object.getOwnPropertySymbols(C.prototype));
+})();
+
+
+
+(function TestStaticClassMethodString() {
+  class C {
+    static a() { return 'A'}
+    static ['b']() { return 'B'; }
+    static c() { return 'C'; }
+    static ['d']() { return 'D'; }
+  }
+  assertEquals('A', C.a());
+  assertEquals('B', C.b());
+  assertEquals('C', C.c());
+  assertEquals('D', C.d());
+  assertArrayEquals(['a', 'b', 'c', 'd'], Object.keys(C));
+})();
+
+
+(function TestStaticClassMethodNumber() {
+  class C {
+    static a() { return 'A'; }
+    static [1]() { return 'B'; }
+    static c() { return 'C'; }
+    static [2]() { return 'D'; }
+  }
+  assertEquals('A', C.a());
+  assertEquals('B', C[1]());
+  assertEquals('C', C.c());
+  assertEquals('D', C[2]());
+  // Array indexes first.
+  assertArrayEquals(['1', '2', 'a', 'c'], Object.keys(C));
+})();
+
+
+(function TestStaticClassMethodSymbol() {
+  var sym1 = Symbol();
+  var sym2 = Symbol();
+  class C {
+    static a() { return 'A'; }
+    static [sym1]() { return 'B'; }
+    static c() { return 'C'; }
+    static [sym2]() { return 'D'; }
+  }
+  assertEquals('A', C.a());
+  assertEquals('B', C[sym1]());
+  assertEquals('C', C.c());
+  assertEquals('D', C[sym2]());
+  assertArrayEquals(['a', 'c'], Object.keys(C));
+  assertArrayEquals([sym1, sym2], Object.getOwnPropertySymbols(C));
+})();
+
+
+
+function assertIteratorResult(value, done, result) {
+  assertEquals({ value: value, done: done}, result);
+}
+
+
+(function TestGeneratorComputedName() {
+  class C {
+    *['a']() {
+      yield 1;
+      yield 2;
+    }
+  }
+  var iter = new C().a();
+  assertIteratorResult(1, false, iter.next());
+  assertIteratorResult(2, false, iter.next());
+  assertIteratorResult(undefined, true, iter.next());
+  assertArrayEquals(['a'], Object.keys(C.prototype));
+})();
+
+
+(function TestToNameSideEffects() {
+  var counter = 0;
+  var key1 = {
+    toString: function() {
+      assertEquals(0, counter++);
+      return 'b';
+    }
+  };
+  var key2 = {
+    toString: function() {
+      assertEquals(1, counter++);
+      return 'd';
+    }
+  };
+  class C {
+    a() { return 'A'; }
+    [key1]() { return 'B'; }
+    c() { return 'C'; }
+    [key2]() { return 'D'; }
+  }
+  assertEquals(2, counter);
+  assertEquals('A', new C().a());
+  assertEquals('B', new C().b());
+  assertEquals('C', new C().c());
+  assertEquals('D', new C().d());
+  assertArrayEquals(['a', 'b', 'c', 'd'], Object.keys(C.prototype));
+})();
+
+
+(function TestToNameSideEffectsNumbers() {
+  var counter = 0;
+  var key1 = {
+    valueOf: function() {
+      assertEquals(0, counter++);
+      return 1;
+    },
+    toString: null
+  };
+  var key2 = {
+    valueOf: function() {
+      assertEquals(1, counter++);
+      return 2;
+    },
+    toString: null
+  };
+
+  class C {
+    a() { return 'A'; }
+    [key1]() { return 'B'; }
+    c() { return 'C'; }
+    [key2]() { return 'D'; }
+  }
+  assertEquals(2, counter);
+  assertEquals('A', new C().a());
+  assertEquals('B', new C()[1]());
+  assertEquals('C', new C().c());
+  assertEquals('D', new C()[2]());
+  // Array indexes first.
+  assertArrayEquals(['1', '2', 'a', 'c'], Object.keys(C.prototype));
+})();
+
+
+(function TestGetter() {
+  class C {
+    get ['a']() {
+      return 'A';
+    }
+  }
+  assertEquals('A', new C().a);
+
+  class C2 {
+    get b() {
+      assertUnreachable();
+    }
+    get ['b']() {
+      return 'B';
+    }
+  }
+  assertEquals('B', new C2().b);
+
+  class C3 {
+    get c() {
+      assertUnreachable();
+    }
+    get ['c']() {
+      assertUnreachable();
+    }
+    get ['c']() {
+      return 'C';
+    }
+  }
+  assertEquals('C', new C3().c);
+
+  class C4 {
+    get ['d']() {
+      assertUnreachable();
+    }
+    get d() {
+      return 'D';
+    }
+  }
+  assertEquals('D', new C4().d);
+})();
+
+
+(function TestSetter() {
+  var calls = 0;
+  class C {
+    set ['a'](_) {
+      calls++;
+    }
+  }
+  new C().a = 'A';
+  assertEquals(1, calls);
+
+  calls = 0;
+  class C2 {
+    set b(_) {
+      assertUnreachable();
+    }
+    set ['b'](_) {
+      calls++;
+    }
+  }
+  new C2().b = 'B';
+  assertEquals(1, calls);
+
+  calls = 0;
+  class C3 {
+    set c(_) {
+      assertUnreachable()
+    }
+    set ['c'](_) {
+      assertUnreachable()
+    }
+    set ['c'](_) {
+      calls++
+    }
+  }
+  new C3().c = 'C';
+  assertEquals(1, calls);
+
+  calls = 0;
+  class C4 {
+    set ['d'](_) {
+      assertUnreachable()
+    }
+    set d(_) {
+      calls++
+    }
+  }
+  new C4().d = 'D';
+  assertEquals(1, calls);
+})();
+
+
+(function TestPrototype() {
+  // Normally a static prototype property is not allowed.
+  class C {
+    static ['prototype']() {
+      return 1;
+    }
+  }
+  assertEquals(1, C.prototype());
+
+  class C2 {
+    static get ['prototype']() {
+      return 2;
+    }
+  }
+  assertEquals(2, C2.prototype);
+
+  var calls = 0;
+  class C3 {
+    static set ['prototype'](x) {
+      assertEquals(3, x);
+      calls++;
+    }
+  }
+  C3.prototype = 3;
+  assertEquals(1, calls);
+
+  class C4 {
+    static *['prototype']() {
+      yield 1;
+      yield 2;
+    }
+  }
+  var iter = C4.prototype();
+  assertIteratorResult(1, false, iter.next());
+  assertIteratorResult(2, false, iter.next());
+  assertIteratorResult(undefined, true, iter.next());
+})();
+
+
+(function TestConstructor() {
+  // Normally a constructor property is not allowed.
+  class C {
+    ['constructor']() {
+      return 1;
+    }
+  }
+  assertTrue(C !== C.prototype.constructor);
+  assertEquals(1, new C().constructor());
+
+  class C2 {
+    get ['constructor']() {
+      return 2;
+    }
+  }
+  assertEquals(2, new C2().constructor);
+
+  var calls = 0;
+  class C3 {
+    set ['constructor'](x) {
+      assertEquals(3, x);
+      calls++;
+    }
+  }
+  new C3().constructor = 3;
+  assertEquals(1, calls);
+
+  class C4 {
+    *['constructor']() {
+      yield 1;
+      yield 2;
+    }
+  }
+  var iter = new C4().constructor();
+  assertIteratorResult(1, false, iter.next());
+  assertIteratorResult(2, false, iter.next());
+  assertIteratorResult(undefined, true, iter.next());
+})();