How to code backwards compatibility into projects

It is simple - you cannot change what has already been shipped.

You will always want to do major changes or refactor code especially if you came to the project new. It can be daunting to move forward when you have to consider backwards compatibility.

The solution is to keep the old interfaces and entities in place.

Create new interfaces and new entities and then use these interfaces and entities. And write code to route calls from the older interfaces to the new interfaces and translate the state from older entities to the new entities.

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