13 Event sourcing: A functional approach to persistence
This chapter covers
- Thinking functionally about persisted data
- Event sourcing concepts and implementation
- Architecture of event-sourced systems
In chapter 11, you saw that in FP we avoid mutating state, especially global state. Did I mention that the database is also state, so it too should be immutable? What? Yes, didn’t you see this one coming? A database is, conceptually, just a data structure. Whether it’s stored in memory or on disk is ultimately just an implementation detail.
You saw in chapter 12 how functional data structures, although immutable, can evolve: you can create new states or new views of any given structure that are built on but don’t alter the original structure. ...
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