LibTest/collection/LinkedList/reduce_A01_t01.dart

/*
 * Copyright (c) 2011, 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 E reduce(E combine(E value, E element))
 * Reduces a collection to a single value by iteratively combining elements
 * of the collection using the provided function.
 * @description Checks that the result is correct for simple functions.
 * @author kaigorodov
 */
import "dart:math";
import "../../../Utils/expect.dart";
import "dart:collection";
import "LinkedList.lib.dart";

check(List<int> a, combine, num expected) {
  LinkedList<MyLinkedListEntry<int>> llist = toLinkedList(a);
  MyLinkedListEntry<int> combine2(MyLinkedListEntry<int> value, MyLinkedListEntry<int> element) =>
    new MyLinkedListEntry<int>(combine(value.value, element.value));
  int actual=llist.reduce(combine2).value;
  Expect.equals(expected, actual);
}	

main() {
  check([1,2,-3], (value, element) => value+element, 0);
  check([1,2,-3], (value, element) => value*element, -6);
  check([0,2,-3], (value, element) => value*element, 0);
  check(const[1,2,-5,-6], (value, element) => max(value,element), 2);
}