| // 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. |
| |
| // @dart = 2.9 |
| |
| /// @assertion Stream<S> map<S>(S convert(T event)) |
| /// Creates a new stream that converts each element of this stream to a new value |
| /// using the convert function. |
| /// @description Checks that each element of this stream is processed. |
| /// @author kaigorodov |
| |
| library map_A01_t01; |
| import "dart:async"; |
| import "../../../Utils/expect.dart"; |
| |
| void check<T>(Stream<T> stream, dynamic convert(T event), List expected) { |
| AsyncExpect.data(expected, stream.map(convert)); |
| } |
| |
| void test(CreateStreamFunction create) { |
| check(create([]), (_) => 1, []); |
| check(create([1,2,3,4,5]), (e) => e, [1,2,3,4,5]); |
| check(create([1,2,3,4,5]), (e) => -e, [-1,-2,-3,-4,-5]); |
| check(create([1,2,3,4,5]), (e) => 0, [0,0,0,0,0]); |
| // expand to the same stream |
| check( |
| create([null, "2", -3, 4.0, []]), |
| (e) => e, |
| [null, "2", -3, 4.0, []] |
| ); |
| } |