LibTest/typed_data/Int32List/where_A03_t01.dart

/*
 * Copyright (c) 2013, 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 Iterable<E> where(bool test(E element))
 * ...
 * Iterating will not cache results, and thus iterating multiple times over the
 * returned [Iterable] may invoke the supplied function test multiple times on
 * the same element.
 * @description Checks that iterating multiple times over the the returned
 * [Iterable] will invoke the supplied function [test] multiple times on the
 * same element.
 * @author msyabro
 */

import "dart:typed_data";
import "../../../Utils/expect.dart";

main() {
  var count = 0;
  bool test(int e) {
    ++count;
    return true;
  }

  var list = new Int32List.fromList([1, 2, 3]);
  var res = list.where(test);

  res.elementAt(0);
  Expect.equals(1,count);

  res.elementAt(0);
  Expect.equals(2,count);

  res.elementAt(1);
  Expect.equals(4,count);

  res.elementAt(2);
  Expect.equals(7,count);
}