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1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 // Feature test for harmony support, alert if not present. | 5 // Feature test for harmony support, alert if not present. |
6 (function () { | 6 (function () { |
7 try { | 7 try { |
8 var f = new Function( | 8 var f = new Function( |
9 '"use strict";'+ | 9 '"use strict";'+ |
10 'class C {' + | 10 'class C {' + |
11 'constructor(x) { this.x = x; };' + | 11 'constructor(x) { this.x = x; };' + |
12 '["foo"]() { return x => this.x + x; };' + | 12 '["foo"]() { return x => this.x + x; };' + |
13 'bar(args) { return this.foo()(...args); };' + | 13 'bar(args) { return this.foo()(...args); };' + |
14 '};' + | 14 '};' + |
15 'return new C(42).bar([100]);'); | 15 'return new C(42).bar([100]);'); |
16 if (f() == 142) return; // supported! | 16 if (f() == 142) return; // supported! |
17 } catch (e) { | 17 } catch (e) { |
18 } | 18 } |
19 | 19 |
20 var message = 'This script needs EcmaScript 6 features ' + | 20 var message = 'This script needs EcmaScript 6 features ' + |
21 'like `class` and `=>`. Please run in a browser with support, ' + | 21 'like `class` and `=>`. Please run in a browser with support, ' + |
22 'for example: chrome --js-flags="--harmony-arrow-functions' + | 22 'for example: chrome --js-flags="--harmony"'; |
23 ' --harmony-classes --harmony-computed-property-names' + | |
24 ' --harmony-spreadcalls"'; | |
25 console.error(message); | 23 console.error(message); |
26 alert(message); | 24 alert(message); |
27 | 25 |
28 })(); | 26 })(); |
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