2 Repository, enum, data & sealed class, hash code, interface | Android Studio Tutorial Kotlin
Source code:
https://github.com/BracketCove/GraphSudokuOpen/tree/master/app/src/main/java/com/bracketcove/graphsudoku/domain
TIMESTAMPS:
Note: For beginners, focus on following along with the code even if some things don’t make sense. If you are persistent, you will learn new things!
0:00:00 Package Overview
0:00:54 The Repository (Facade) Pattern and benefits
0:02:41 Enum Class (Dictionary) for legible code
0:04:24 Kotlin data classes for user and game data models
0:07:01 How to virtually represent each square in a Sudoku Game
0:09:58 hash code usage for uniqueness a tracking references
(Note: usage of the hash code will make more sense when we start building the UI and Graph algorithms)
0:13:34 Virtually representing a Sudoku Game with a Hashmap of Lists O_O (adjaceny list)
0:16:50 Coding our interfaces to employ the Repository (Facade Pattern)
0:17:17 Some thoughts on when use cases (a.k.a. interactors or transaction scripts) are appropriate
(Note: ignore this rambling if you’re a beginner; it’s not critical to understand yet)
0:18:44 Using Kotlin Function Types for success and error handling
0:24:25 Using Kotlin Sealed Classes for success and error handling
0:27:20 From here on we just write code to finish off the package
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