Mixin

Dart has the language conecpt of mixing clases. These are classes which defines code that can be used in multiple class hierarchies. They are intended to provide member implementations en masse.

The context of mixing has two keywords which are with and mixin. The with keyword is used to add a mixin to a class. mixin indicates that the class

To mark a class as mixing class, you need to add the mixin keyword to the class definition.