import 'dart:io';
void main() {
performTask();
}
void performTask() {
task1();
task2();
task3();
}
void task1() {
print('task1');
}
void task2() {
Duration timeDuration = Duration(seconds: 3);
sleep(timeDuration);
print('task2');
}
void task3() {
print('task3');
}
After executing first function that is task1() it throws an error:
Uncaught Error: Unsupported operation: ProcessUtils._sleep
I just hit the same roadblock! Not sure how to get sleep to work, but i found that using async/await is a bit more predictable:
// Unused import
// import 'dart:io'; // Delete me
void main() {
performTask();
}
// No need for async/await here, just the method in which it's used to await Future.delayed
void performTask() {
task1();
task2();
task3();
}
void task1() {
print('task1');
}
// I'm still a bit new to flutter, but as I understand it, best practice is to use Future<T> myFunction() {...} when defining async/await method.
// In this case <T> is <void> because you're not returning anything!
Future<void> task2() async {
Duration timeDuration = Duration(seconds: 3);
// sleep(timeDuration) // Delete Me
await Future.duration(timeDuration); // replacement for the sleep method, comes from the 'package:flutter/material.dart'
print('task2');
}
void task3() {
print('task3');
}
Credit: How can I "sleep" a Dart program
Since Future.duration doesn't
await Future.delayed(const Duration(seconds: 1));
credit: How can I "sleep" a Dart program
