ioExample.dart

import 'dart:async';

import 'dart:io';


main(List<String> arguments) async{
  for (var i = 0; i < 10; i++) {
    write(i.toString());
  }
  var fileContents = await readFile();
  print(fileContents);
}

Future<String> get _localPath async {
  final directory = new Directory("./");
  return directory.path;
}

Future<File> get _localFile async {
  final path = await _localPath;
  return new File("$path/data");
}

Future<File> write(String contents) async {
  final file = await _localFile;
  return file.writeAsString("$contents\n", mode: FileMode.append);
}

Future<String> readFile() async {
  final file = await _localFile;
  try {
    String result = await file.readAsString();
    return result;
  } catch (e) {
    return "no results";
  }
}