公式ページのイントロダクションをもとにした使用例のメモです。
dart.dev
void main() {
int astronauts = -1;
try {
if (astronauts <= 0) {
throw StateError('No astronauts.');
}
print('$astronauts astronauts');
} catch (e) {
print(e);
}
}
import 'dart:io';
void main() {
describeFlybyObjects(flybyObjects);
}
var flybyObjects = ['Jupiter', 'Saturn', 'Uranus', 'Neptune'];
Future<void> describeFlybyObjects(List<String> flybyObjects) async {
try {
for (final object in flybyObjects) {
var description = await File('lib/$object.txt').readAsString();
print(description);
}
} on IOException catch (e) {
print('Could not describe object: $e');
} finally {
flybyObjects.clear();
}
}