Both using an interface method and using extension functions can be valid approaches for data conversion in Android. The choice between them depends on the specific requirements and preferences of your project.

Using an interface method, as shown in your example, is a common approach to implementing mappers. By defining a separate mapper class and implementing the mapFrom function in that class, you encapsulate the conversion logic and keep it separate from the data classes. This approach allows for better separation of concerns and makes the code more maintainable, especially when dealing with complex conversions involving multiple properties or nested objects.

On the other hand, using extension functions can provide a more concise and convenient way to define mappings directly on the data classes themselves. Extension functions allow you to add new functionality to existing classes without modifying their source code. This can be beneficial when you want to keep the conversion logic closely associated with the data class and have a more compact code structure.

In summary, using an interface method is generally recommended for more complex conversions or when you need to encapsulate the conversion logic in separate mapper classes. On the other hand, extension functions can be a good choice for simpler conversions or when you prefer to keep the conversion logic closer to the data classes.

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