// Copyright (c) 2016, 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.

// @dart = 2.9

/// @assertion Functions include function declarations, methods, getters,
/// setters, constructors and function literals.
/// All functions have a signature and a body.
/// functionSignature:
///   metadata returnType? identifier formalParameterList
/// ;
/// returnType: void | type
/// ;
/// functionBody:
///   async? '=>' expression ';' | (async | async* | sync*)? block
/// ;
/// block:
///   '{' statements '}'
/// ;
///
/// @description Checks different valid variants of synchronous
/// generator methods
///
/// @author a.semenov@unipro.ru

import '../../Utils/expect.dart';

class A {
  Iterable<String> a1() sync* {
    yield 'a';
  }

  Iterable a2() sync* {
    yield 1;
  }

  a3() sync* {
    yield 2;
  }
}

class B {
  Iterable<String> b1(int x) sync* {
    yield new String.fromCharCode(x + 'a'.codeUnitAt(0));
  }

  Iterable b2(String y) sync* {
    yield y.length;
  }

  b3(z) sync* {
    yield z;
  }
}

main() {
  A a = new A();
  Expect.equals('a', a.a1().first);
  Expect.equals(1, a.a2().first);
  Expect.equals(2, a.a3().first);
  B b = new B();
  Expect.equals('e', b.b1(4).first);
  Expect.equals(5, b.b2('hello').first);
  Expect.equals(b.b3, b.b3(b.b3).first);
}