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Tags: cqrs event sourcing video
Status: release
Date: 2022-05-28

State, as a first level derivative


Greg Young, in this talk mentions

State, as a first-level derivative


In his example, he asks whether a bank account balance is simply a number in a database column, or is it a total of all transactions since an account's creation.


Balance becomes function that that takes the transactions and returns a deterministic result