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Factory functions

https://wanago.io/2019/12/02/javascript-design-patterns-factories-typescript/

In the code above, we specify explicitly that when we create a music teacher, we need to pass the properties of a music teacher. Otherwise, the TypeScript compiler would throw an error.

Thanks to proper typing, TypeScript now knows that the  , for example, is an instance of the CodingTeacher class.

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