CODE EXAMPLE FOR DART

dart class with

Mixins are a way of reusing a class’s code in multiple class hierarchies.

To use a mixin, use the with keyword followed by one or more mixin names. The following example shows two classes that use mixins:

class MyClass with MyMixin {
  // ···
}

To implement a mixin, create a class that extends Object and declares no constructors. 
Unless you want your mixin to be usable as a regular class, use the mixin keyword instead of class. 
For example:

mixin MyMixin {
  // ···
}