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futures/futures-api
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// Copyright (c) 2013, 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. | |
import 'dart:async'; | |
Future<void> printDailyNewsDigest() { | |
final future = gatherNewsReports(); | |
return future.then(print); | |
// You don't *have* to return the future here. | |
// But if you don't, callers can't await it. | |
} | |
main() { | |
printDailyNewsDigest(); | |
printWinningLotteryNumbers(); | |
printWeatherForecast(); | |
printBaseballScore(); | |
} | |
printWinningLotteryNumbers() { | |
print('Winning lotto numbers: [23, 63, 87, 26, 2]'); | |
} | |
printWeatherForecast() { | |
print("Tomorrow's forecast: 70F, sunny."); | |
} | |
printBaseballScore() { | |
print('Baseball score: Red Sox 10, Yankees 0'); | |
} | |
const news = '<gathered news goes here>'; | |
const oneSecond = Duration(seconds: 1); | |
// Imagine that this function is more complex and slow. :) | |
Future<String> gatherNewsReports() => | |
Future.delayed(oneSecond, () => news); | |
// Alternatively, you can get news from a server using features | |
// from either dart:io or dart:html. For example: | |
// | |
// import 'dart:html'; | |
// | |
// Future<String> gatherNewsReportsFromServer() => HttpRequest.getString( | |
// 'https://www.dartlang.org/f/dailyNewsDigest.txt', | |
// ); |
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