What is Dart type?

The Dart language is type safe : it uses a combination of static type checking and runtime checks to ensure that a variable’s value always matches the variable’s static type, sometimes referred to as sound typing. Although types are mandatory, type annotations are optional because of type inference.

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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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