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[https://medium.com/flutter-community/dart-what-are-mixins-3a72344011f3] - - public:mzimmerm
dart, extend, good, implement, mixin, with - 6 | id:959123 -

Also describes 1) a edge scenario where class is used as mixin, then it should define a factory constructor and be abstract. 2) if the same message on 2 mixins is 'move' the 'move' on the rightmost mixin is called (and no other mixin's 'move', unless the rightmost 'move' calls 'super'.

[https://stackoverflow.com/questions/53886304/understanding-factory-constructor-code-example-dart] - - public:mzimmerm
constructor, dart, factory - 3 | id:958961 -

A good example of this use case in Dart is the abstract HTML Element class, which defines dozens of named factory constructor functions returning different subclasses. For example, Element.div() and Element.li() return and elements, respectively.

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