alluring-lotus-3583

readme.md

alluring-lotus-3583

Created with <3 with dartpad.dev.

main.dart

//Exploring basic Kotlin style _when_ syntax in Dart

void main() {
  int code = 100;
  var x = when(code,{
      100: 1,
      200: () => print("Success"),
      400: () => print("Client Error"),
      500: () => print("Server Error"),
      (code > 400 && code < 500): () => print("Undefined client error: $code")
    }, () => {print("Unknown Code")
  });

  print("x: $x");
}

dynamic when<T>(T condition, Map<dynamic, dynamic> branches, Function() none) {
  var consumed = false;
  var returnValue;
  branches.forEach((key, value) {
    if (key.runtimeType == condition.runtimeType && key == condition) {
      if (value.runtimeType == Function) {
        value.call();
        consumed = true;
      } else {
        returnValue = value;
        consumed = true;
      }
    } else if (key.runtimeType == bool && key as bool == true) {
      value.call();
      consumed = true;
    }
  });

  if (consumed) {
    return returnValue;
  } else {
    none.call();
  }
}