"Program to interfaces, not implementations" is a very important concept in software design.
It is used to decouple your code from implementation-specific details.
A good use case for this is when creating repositories that connect to external data sources:
Once you have an interface (abstract class), you can implement it with a concrete implementation.
You can even create a "fake", which can be very useful in your tests.
During app startup, you can initialize your repository with a concrete instance (using a service locator or any other dependency injection system).
And the rest of your app can just access the repository using the base abstract class.
What are the benefits?
- You can swap your real repository with a completely different implementation - the rest of your code doesn't change at all
- You can mock the repository in your tests, so that they run faster and more reliably
Follow me for more tips like this: @biz84
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