| /* |
| * Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file |
| * for details. All rights reserved. Use of this source code is governed by a |
| * BSD-style license that can be found in the LICENSE file. |
| */ |
| /** |
| * @assertion an extension declaration is a top-level declaration with a grammar |
| * similar to: |
| * <extension> ::= |
| * `extension' <identifier>? <typeParameters>? `on' <type> `?'? `{' |
| * memberDeclaration* |
| * `}' |
| * Such a declaration introduces its name (the identifier) into the surrounding |
| * scope. The name does not denote a type, but it can be used to denote the |
| * extension itself in various places. The name can be hidden or shown in import |
| * or export declarations. |
| * |
| * @description Check that the name does not denote a type |
| * @compile-error |
| * @author sgrekhov@unipro.ru |
| */ |
| |
| |
| extension MyFancyList<T> on List<T> { |
| int get doubleLength => this.length * 2; |
| List<T> operator-() => this.reversed.toList(); |
| List<List<T>> split(int at) => <List<T>>[this.sublist(0, at), this.sublist(at)]; |
| static String get className => "List"; |
| } |
| |
| main() { |
| MyFancyList<String> list = ["Lily", "was", "here"]; |
| } |