How to handle the lack of String.format() in Dart

Conclusion

Since String.format() does not exist as a built-in feature in Dart, use the sprintf package as an alternative.
https://pub.dev/packages/sprintf
*If this is incorrect or if there are other methods, I would appreciate your comments.

Code quoted from the sprintf example:

import 'package:sprintf/sprintf.dart';
void main() {
	print(sprintf("%04i", [-42]));
	print(sprintf("%s %s", ["Hello", "World"]));
	print(sprintf("%#04x", [10]));
}

flutter: -042
flutter: Hello World
flutter: 0x0a