> "optional types" means "no types" While it is possible to write Dart code without using types (hence "optional") - the vast majority of Dart code is written

> "optional types" means "no types" While it is possible to write Dart code without using types (hence "optional") - the vast majority of Dart code is written using types. The new Dart compiler also provides a "strong mode" which enforces strong typing in order to generate cleaner Javascript code.