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In Dart, you can define code outside of classes. Variables, functions, getters, and setters can all live outside of class. Dart doesn't have keywords for public, private, or protected. Dart uses two-character indentation by convention instead of four. Dart supports single or double quotes when specifying strings. To mark a Dart identifier as private to its library, start its name with an underscore. If the expression is an identifier, skip the braces. Shorten one-line functions or methods using fat arrow notation.