I am watching this video, Stuart Sierra's 2012 talk about Functional Design 
Patterns: 

http://www.infoq.com/presentations/Clojure-Design-Patterns

His description of event sourcing for functional programming emphasizes: 
---- recreate past states
---- recreate any past state by reducing over events
---- just store the inputs
---- cache any intermediate state
---- lost of flexibility
---- every event to the system is a data structure
---- problem: perhaps too many data structures


I'm curious where is this pattern actually used? 




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