LibTest/collection/LinkedHashSet/LinkedHashSet.from_A03_t01.dart

// 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 LinkedHashSet.from(Iterable<E> elements)
/// ...
/// All the [elements] should be assignable to [E]. The [elements] iterable
/// itself may have any element type, so this constructor can be used to
/// down-cast a [Set]
/// @description Checks that the elements of the iterable may have any element
/// type, so this constructor can be used to down-cast a [Set]
/// @author sgrekhov@unipro.ru

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

check(LinkedHashSet set, Iterable expected) {
  int i = 0;
  for(var v in expected) {
    Expect.equals(v, set.elementAt(i++));
  }
}

main() {
  LinkedHashSet<num> superSet =
      new LinkedHashSet<num>.from([0, 1, 2.1, 3.14, 4]);
  Iterable<num> tmp = superSet.where((v) => v is int);
  LinkedHashSet<int> subSet = new LinkedHashSet<int>.from(tmp);
  check(subSet, [0, 1, 4]);
}