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Merge pull request #73 from bmeaut/doc/chapter-5/update-materials
Doc/chapter 5/update materials
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48 changes: 48 additions & 0 deletions
48
projects/starters/chapter_05/lib/async/async_sample_1.dart
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| import "dart:async"; | ||
|
|
||
| Future<String> myLongRunningFunction() => Future.delayed( | ||
| Duration(seconds: 3), | ||
| () { | ||
| print("Inside the future"); | ||
| throw Exception("No internet connection!"); | ||
| return "Hello in the future!"; | ||
| }, | ||
| ); | ||
|
|
||
| void main() { | ||
| print("Starting main"); | ||
| var futureResult = myLongRunningFunction(); | ||
| print("Immediate result: $futureResult"); | ||
| futureResult | ||
| .then( | ||
| (result) { | ||
| print("Result of function: $result"); | ||
| }, | ||
| ) | ||
| .timeout( | ||
| Duration( | ||
| seconds: 1, | ||
| ), | ||
| ) | ||
| .catchError( | ||
| (error) { | ||
| print("Caught TimeoutException error: $error"); | ||
| }, | ||
| test: (e) => e is TimeoutException, | ||
| ) | ||
| .catchError( | ||
| (error) { | ||
| print("Caught String error: $error"); | ||
| }, | ||
| test: (e) => e is String, | ||
| ) | ||
| .whenComplete(() { | ||
| print("Inside whenComplete"); | ||
| }); | ||
| var i = 0; | ||
| /*while(true){ | ||
| for (int j = 0; j < 1000; j++) | ||
| print("${i++}"); | ||
| } !!FREEZES!!*/ | ||
| print("Ending main"); | ||
| } |
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projects/starters/chapter_05/lib/async/async_sample_2.dart
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| Future<String> myLongRunningFunction() => Future.delayed( | ||
| Duration(seconds: 3), | ||
| () { | ||
| print("Inside the future"); | ||
| throw Exception("No internet connection!"); | ||
| return "Hello in the future!"; | ||
| }, | ||
| ); | ||
|
|
||
| Future<String> myAsyncFunction() async { | ||
| await Future.delayed(Duration(seconds: 3)); | ||
| print("Inside the future"); | ||
| throw Exception("No internet connection"); | ||
| return "Hello in the future"; | ||
| } | ||
|
|
||
| void asyncVoidFunction() async { | ||
| print("Starting async void function!"); | ||
| await Future.delayed(Duration(seconds: 1)); | ||
| print("Ending async void function!"); | ||
| } | ||
|
|
||
| void myAsyncTestFunction() async { | ||
| print("Starting async func"); | ||
| asyncVoidFunction(); | ||
| //await asyncVoidFunction(); //!ERROR! Cannot await void function | ||
| print("Calling long running function!"); | ||
| try { | ||
| var result = await myLongRunningFunction(); | ||
| print("Immediate result: $result"); | ||
| } catch (e) { | ||
| print("Caught error: $e"); | ||
| } finally { | ||
| print("Inside finally"); | ||
| } | ||
| } | ||
|
|
||
| void main() { | ||
| print("Starting main function!"); | ||
| myAsyncTestFunction(); | ||
| print("Ending main function!"); | ||
| } |
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projects/starters/chapter_05/lib/async/generator_sample_1.dart
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| import "dart:math"; | ||
|
|
||
| Iterable<int> calculatePrimes() sync* { | ||
| yield 2; | ||
| for (int i = 3; true; i++) { | ||
| if (calculatePrimes() | ||
| .takeWhile((prime) => prime <= sqrt(i)) | ||
| .every((prime) => i % prime != 0)) { | ||
| yield i; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| void main() { | ||
| calculatePrimes().take(20).forEach(print); | ||
| } |
14 changes: 14 additions & 0 deletions
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projects/starters/chapter_05/lib/async/generator_sample_2.dart
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| Stream<int> myStreamGeneratorFunction() async* { | ||
| yield 1; | ||
| await Future.delayed(Duration(milliseconds: 200)); | ||
| yield 2; | ||
| await Future.delayed(Duration(milliseconds: 200)); | ||
| yield 3; | ||
| await Future.delayed(Duration(milliseconds: 200)); | ||
| } | ||
|
|
||
| void main() async { | ||
| await for (var value in myStreamGeneratorFunction()) { | ||
| print(value); | ||
| } | ||
| } |
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