dart

$ sudo apt-get update
$ sudo apt-get install apt-transport-https
$ sudo sh -c 'wget -qO- https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -'
$ sudo sh -c 'wget -qO- https://storage.googleapis.com/download.dartlang.org/linux/debian/dart_stable.list > /etc/apt/sources.list.d/dart_stable.list'

main(List<String> args) {
  var sum = 0;
  var given_list = [1, 2, 3, 4, 5];
  for (var i = 0; i < given_list.length; i++) {
    sum += given_list[i];
  }

  print("Sum (for loop): ${sum}");

  sum = 0;
  given_list.forEach((e) => sum += e);
  print("Sum (forEach): ${sum}");

  sum = given_list.reduce((value, element) => value + element);
  print("Sum (reduce): ${sum}");

  sum = given_list.fold(0, (previous, current) => previous + current);
  print("Sum (fold): ${sum}");
}

choco install dart-sdk

var ints = const <int?>[0, null];
var zero = ints[0];
var one = zero! + 1;
var zeroOne = <int?>[zero, one];

dart migrate --apply-changes

flutter clean
flutter pub get

console.log(sass.info);
// dart-sass    1.32.10 (Sass Compiler) [Dart]
// dart2js  2.0.0   (Dart Compiler) [Dart]

analyzer:
  enable-experiment:
    - non-nullable

echo 'Internal Server Error';