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Write extension functions for your own classes in Kotlin
source link: https://blog.frankel.ch/write-extension-functions-own-classes-kotlin/
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A recent question on Kotlin’s Reddit came to my attention lately: 'Why is it bad to write extension functions for classes that you own?' One of the answer was that it was the opposite: it’s a good practice, and for several reasons. Among them were two very important ones that improve the design of one’s code: Able to call the function on a nullable. For a class with generic types, add a function that is only available when a specific type is used.
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