dart + flutter dart null How do I initialize non-nullable members in a constructor body?I've created my class in Dart this way, but I'm getting the Non-nullable instance field 'text' must be initialized. Try adding an initializer expression, or add a field initializer in this construc... wono | discuss | tweet + flutter dart map How can I grab the last N elements in a Map<int, dynamic>?I currently have a Map<int, dynamic> where the key is an order of insertion. For example const Map<int, dynamic> log = { 1: {'startDate': 1111, 'endDate': 2222}, 2: {'startDate': 12... wono | discuss | tweet + flutter dart set Dart SetIn this tutorial, you'll learn about Dart Set class and how to manipulate sets effectively. wono | discuss | tweet + flutter dart map copy Clone a List, Map or Set in DartComing from a Java background: what is the recommended way to "clone" a Dart List, Map and Set? wono | discuss | tweet + flutter dart future Dartlang wait more than one futureI want to do something after a lot of future functions are done, but I do not know how to write the code in dart? the code is like this: for (var d in data) { d.loadData().then() } // when all lo... wono | discuss | tweet + flutter dart map How to access map keys through index? Dartdartques = {'Color':[], 'Fruits':[], 'Hobbies':[]}; How to access the values using index in map? I need to access only key or value using index. Just like we do in list =>list[1] wono | discuss | tweet + flutter dart 효과적인 Dart: 사용법언어 기능을 사용하여 유지 관리 가능한 코드를 작성하기 위한 가이드라인. wono | discuss | tweet + flutter dart 문자열 [Flutter] 다양한 String Method runtimeType 변수의 타입을 알려줍니다. isEmpty / isNotEmpty 문자열이 비워 있는지, 아닌지를 판별 한다. compareTo 문자열 정렬 순서를 비교합니다. 같으면 0, 더 앞이면 -1, 뒤면 1을 반환합니다. contains(a) wono | discuss | tweet + flutter dart stream sink What is the difference between streamController.add() and streamController.sink.add()?There are two ways that i know to add data to streamcontroller, one directly and other by use of a sink. I tried to read docs of Sink but i am not able to understand its concept like piping of data... wono | discuss | tweet + flutter dart stream How to unit test Stream.listen() in DartConsider the following test code ... main() { StreamController controller; setUp(() { controller = StreamController.broadcast(sync: false); }); tearDown(() { controller.close(); ... wono | discuss | tweet + flutter dart stream How to check if any active Stream has already been listened to?Is there any way to check if there is any active Stream that has already been listened to or not in Dart/Flutter? Suppose there is a Stream that has been listened to on one Screen. But, I need to l... wono | discuss | tweet + flutter dart stream [번역] 다트 비동기 프로그래밍 : streams wono | discuss | tweet + flutter dart stream [Programming/Dart] 스트림 (Stream)스트림이란? 스트림은 데이터나 이벤트가 들어오는 통로다. 즉, 파이프나 다리와 같다고 생각하면 된다. 앱을 만들다보면 데이터를 처리할 일이 많은데, 어느 타이밍에 데이터가 들어올지 정확히 알기 어렵다. 스트림은 이와 같은 비동기 작업을 할 때 주로 쓰인다. 예를 들어, 네트워크에서 데이터를 받아 UI에 보여주는 상황을 생각해보자. 언제 네트워크에서 데이터를 받을지 알 수 없다. 이런 문제를 스트림은 데이터 생성과 소비하는 곳을 따로둬서 이 문제를 해결한다. import 'dart:async'; void main() { // 1초마다 데이터 1개를 최대 5개까지 만듦. Stream stream = Stream.periodic(Duration(seconds: 1), (int x) => x).take(5); .. wono | discuss | tweet + flutter dart future complete Check if Future is completeBefore 'm3' you could check if a Future was completed with 'completer.future.isComplete' this seems to be gone. Is there a replacement? or do I need to save it myself then (it seems inside the wono | discuss | tweet + flutter dart logging avoid_print wono | discuss | tweet + flutter dart class Re-instantiate Class variable in Dart / FlutterAt the beginning of my app I have a global variable gameData which is declared and instantiated as: GameData gameData = GameData(); Later I want to clear the gameData variable and re-instantiate/r... wono | discuss | tweet + flutter dart class a class method named ._() function in dart?I've seen this code can anyone please explain to me what the AppTheme._() means, as I've read about its singleton class in dart but I really can't understand how it works. class AppTheme { AppTh... wono | discuss | tweet + flutter dart string In dart, split string into two parts using length of first stringI have a string hiWorld and i want to split this string in two parts hi and World by length of first word hi which is of length 2. This is what i want to do List<String> list = ("hiWorld"). wono | discuss | tweet + flutter dart image canvas Rendering a Canvas to an Image in a way that doesn't lock up Flutter UII need to draw some images in Flutter using geometric primitives, to both show in-app and cache for later use. What I'm doing right now is something similar to this: import 'dart:ui'; final wono | discuss | tweet + flutter dart getter Getter and Setter Methods in Dart - GeeksforGeeksA Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. wono | discuss | tweetNext
+ flutter dart null How do I initialize non-nullable members in a constructor body?I've created my class in Dart this way, but I'm getting the Non-nullable instance field 'text' must be initialized. Try adding an initializer expression, or add a field initializer in this construc... wono | discuss | tweet
+ flutter dart map How can I grab the last N elements in a Map<int, dynamic>?I currently have a Map<int, dynamic> where the key is an order of insertion. For example const Map<int, dynamic> log = { 1: {'startDate': 1111, 'endDate': 2222}, 2: {'startDate': 12... wono | discuss | tweet
+ flutter dart set Dart SetIn this tutorial, you'll learn about Dart Set class and how to manipulate sets effectively. wono | discuss | tweet
+ flutter dart map copy Clone a List, Map or Set in DartComing from a Java background: what is the recommended way to "clone" a Dart List, Map and Set? wono | discuss | tweet
+ flutter dart future Dartlang wait more than one futureI want to do something after a lot of future functions are done, but I do not know how to write the code in dart? the code is like this: for (var d in data) { d.loadData().then() } // when all lo... wono | discuss | tweet
+ flutter dart map How to access map keys through index? Dartdartques = {'Color':[], 'Fruits':[], 'Hobbies':[]}; How to access the values using index in map? I need to access only key or value using index. Just like we do in list =>list[1] wono | discuss | tweet
+ flutter dart 문자열 [Flutter] 다양한 String Method runtimeType 변수의 타입을 알려줍니다. isEmpty / isNotEmpty 문자열이 비워 있는지, 아닌지를 판별 한다. compareTo 문자열 정렬 순서를 비교합니다. 같으면 0, 더 앞이면 -1, 뒤면 1을 반환합니다. contains(a) wono | discuss | tweet
+ flutter dart stream sink What is the difference between streamController.add() and streamController.sink.add()?There are two ways that i know to add data to streamcontroller, one directly and other by use of a sink. I tried to read docs of Sink but i am not able to understand its concept like piping of data... wono | discuss | tweet
+ flutter dart stream How to unit test Stream.listen() in DartConsider the following test code ... main() { StreamController controller; setUp(() { controller = StreamController.broadcast(sync: false); }); tearDown(() { controller.close(); ... wono | discuss | tweet
+ flutter dart stream How to check if any active Stream has already been listened to?Is there any way to check if there is any active Stream that has already been listened to or not in Dart/Flutter? Suppose there is a Stream that has been listened to on one Screen. But, I need to l... wono | discuss | tweet
+ flutter dart stream [Programming/Dart] 스트림 (Stream)스트림이란? 스트림은 데이터나 이벤트가 들어오는 통로다. 즉, 파이프나 다리와 같다고 생각하면 된다. 앱을 만들다보면 데이터를 처리할 일이 많은데, 어느 타이밍에 데이터가 들어올지 정확히 알기 어렵다. 스트림은 이와 같은 비동기 작업을 할 때 주로 쓰인다. 예를 들어, 네트워크에서 데이터를 받아 UI에 보여주는 상황을 생각해보자. 언제 네트워크에서 데이터를 받을지 알 수 없다. 이런 문제를 스트림은 데이터 생성과 소비하는 곳을 따로둬서 이 문제를 해결한다. import 'dart:async'; void main() { // 1초마다 데이터 1개를 최대 5개까지 만듦. Stream stream = Stream.periodic(Duration(seconds: 1), (int x) => x).take(5); .. wono | discuss | tweet
+ flutter dart future complete Check if Future is completeBefore 'm3' you could check if a Future was completed with 'completer.future.isComplete' this seems to be gone. Is there a replacement? or do I need to save it myself then (it seems inside the wono | discuss | tweet
+ flutter dart class Re-instantiate Class variable in Dart / FlutterAt the beginning of my app I have a global variable gameData which is declared and instantiated as: GameData gameData = GameData(); Later I want to clear the gameData variable and re-instantiate/r... wono | discuss | tweet
+ flutter dart class a class method named ._() function in dart?I've seen this code can anyone please explain to me what the AppTheme._() means, as I've read about its singleton class in dart but I really can't understand how it works. class AppTheme { AppTh... wono | discuss | tweet
+ flutter dart string In dart, split string into two parts using length of first stringI have a string hiWorld and i want to split this string in two parts hi and World by length of first word hi which is of length 2. This is what i want to do List<String> list = ("hiWorld"). wono | discuss | tweet
+ flutter dart image canvas Rendering a Canvas to an Image in a way that doesn't lock up Flutter UII need to draw some images in Flutter using geometric primitives, to both show in-app and cache for later use. What I'm doing right now is something similar to this: import 'dart:ui'; final wono | discuss | tweet
+ flutter dart getter Getter and Setter Methods in Dart - GeeksforGeeksA Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. wono | discuss | tweet