Commands

- there r two ways to execute code
 `dart main.dart` : directly runs code. useful for quick and single dart file
 `dart run main.dart` : useful for running a project with lot of other dependencies specified in `pubspec.yaml` file
- dart uses AOT(Ahead Of Time) compiler to create executable and jit(Just In Time) interpreter to run code directly which means features like hot reload can be used
 `dart run main.dart` : jit interpreter
 `dart compile exe main.dart -o output` and to run this self contained executable called output `./output`