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We are building a Movie App with the best coding practices and tools out there. In the previous article, datasource doc, I have explained how to create a data source and how to make API calls. In this article, I will show how you can create repositories and usecases to separate the data layer from the UI layer by introducing the domain layer, with the help of abstraction.

Problem
You have seen in the previous article, that we were calling data source from **main.dart**, which is your UI layer. In a long run, this is not right and certainly needs a layer in between. Also, what this does is, it tightly couples the UI layer with API responses, which can change over time and you'll end up making changes to the data layer as well as the UI layer.

##Solution

Find in the Video :)

Timeline
0:32 Problem - Data Source in UI
01:45 Solution - Abstract Repository
02:18 Implement Repository
04:50 UseCase
07:30 Dartz
08:34 Error Handling
10:24 Fold Operator
11:28 More UseCases
13:20 Caveat
15:52 NoParams

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