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 // Copyright (c) 2017, 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 take(int count) /// Returns a lazy iterable of the [count] first elements of this iterable. /// @description Checks that [Iterable] that contains the first [count] elements /// is returned. /// @author iarkh@unipro.ru import "dart:collection"; import "dart:math" as Math; import "../../../Utils/expect.dart"; class MyIterable extends Object with IterableMixin { List _content; MyIterable(List list): _content = list; Iterator get iterator { return _content.iterator; } } check(List list, int n) { IterableMixin iterable = new MyIterable(list); Iterable res = iterable.take(n); Expect.equals(Math.min(iterable.length, n), res.length); int k = 0; for (var el in res) { Expect.equals(iterable.elementAt(k), el); k++; } } main() { check([1, 2, -3, 4], 4); check([1, 2, -3, 4], 0); check([11, 2, -3, 4], 2); check([1, 22, -3, 4], 4); check(const[1, 2, -5, -6, 100], 0); check(const[1, -1, 2, -5, -6], 1); check(const[0, 0, 1, 2, -5, -6], 2); check(const[0, 0, 1, 2, -5, -6], 6); }