blob: 692a4f5d0bd144bceb7eaa9c78a6891f620fa101 [file] [log] [blame]
// Copyright (c) 2012, 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
import "dart:collection";
import "package:expect/expect.dart";
class A extends IterableBase {
int count;
A(this.count);
Iterator get iterator {
return new AIterator(count);
}
}
class AIterator implements Iterator {
int _count;
int _current;
AIterator(this._count);
bool moveNext() {
if (_count > 0) {
_current = _count;
_count--;
return true;
}
_current = null;
return false;
}
get current => _current;
}
main() {
var a = new A(10);
Expect.equals(10, a.length);
a = new A(0);
Expect.equals(0, a.length);
a = new A(5);
Expect.equals(5, a.map((e) => e + 1).length);
Expect.equals(3, a.where((e) => e >= 3).length);
}