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 // 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 Iterable takeWhile(bool test(E value)) /// Returns a lazy iterable of the leading elements satisfying test /// @description Checks that all first elements that satisfy test are retained, /// and elements after that, are skipped. /// @author kaigorodov library takeWhile_A01_t01; import "../../../Utils/expect.dart" ; void check(Iterable a0, bool tst(var element)) { Iterator it0 = a0.iterator; Iterable a = a0.takeWhile(tst); Iterator it = a.iterator; // check that the beginning of a0 is identical to a bool hasNext0 = it0.moveNext(); int len = 0; for (;;) { bool hasNext = it.moveNext(); if (!hasNext) break; Expect.isTrue(tst(it0.current)); Expect.equals(it0.current, it.current); len++; hasNext0 = it0.moveNext(); } Expect.equals(a.length, len); // count the rest int skipCount = 0; while (hasNext0) { skipCount++; hasNext0 = it0.moveNext(); } Expect.equals(a0.length, len + skipCount); } test(Iterable create([Iterable content])) { Iterable a0 = create([1, 3, 7, 4, 5, 6]); check(a0, (var element) => element == 1); check(a0, (var element) => true); check(a0, (var element) => false); check(a0, (var element) => element > 4); check(a0, (var element) => element < 4); check(a0, (var element) => element == 4); }