Answers for "dart uses which case"

dart uses which case

Dart and Flutter Guidelines >>>>>

DO name types using UpperCamelCase:

	class SliderMenu { ... }

	class HttpRequest { ... }

	typedef Predicate<T> = bool Function(T value);
    
    class Foo {
  		const Foo([Object? arg]);
	}

	@Foo(anArg)
	class A { ... }

	@Foo()
	class B { ... }

DO name extensions using UpperCamelCase:

	extension MyFancyList<T> on List<T> { ... }

	extension SmartIterable<T> on Iterable<T> { ... }

DO name libraries, packages, directories, and source files using 
lowercase_with_underscores:

	library peg_parser.source_scanner;

	import 'file_system.dart';
	import 'slider_menu.dart';

More information here: https://dart.dev/guides/language/effective-dart/style