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[androidnewsandcodingstuff]

Kotlin Sealed Classes

What is kotlin sealed classes?

- It’s a kind of ADT(Algebric Data Type), used for representing restricted class hierarchies, also aollowing a datatype to be one of a predefined set of types.

- Kotlin sealed classes let you easily handle error data. When combined with LiveData you can use one LiveData to represent both the success path and the error path. Way better than using two variables.

Docs:

How to use sealed classes in recyclerview adapter ?

- You can also use sealed classes in a RecyclerView adapter. They’re a perfect fit for ViewHolders - with a clean set of types to dispatch explicitly to each holder. Used as an expression, the compiler will error if all types aren’t matched.

How to use sealed classes as recyclerview callbacks?

- Going further with RecyclerViews, if we have a lot of callbacks from a RecyclerView item, like this one with detail clicks, shares, and delete actions, we can use sealed classes. One callback taking one sealed class can handle all the things!

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