What is factory keyword?

Factory keyword is used when implementing constructors that do not create new instances of the existing class . A factory constructor can return value from cache or from an instance of a sub-type. Factory constructor does not have access to this keyword.29 Mar 2020

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Why do we need a mixins?

Mixins encourage code reuse and can be used to avoid the inheritance ambiguity that multiple inheritance can cause (the “diamond problem”), or to work around lack of support for multiple inheritance in a language. A mixin can also be viewed as an interface with implemented methods.

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