diaries: today my app finally evolved persistence: it keeps a log of events in an append file and can recreate its state from this log on launch. No special revelations, just wading through clunky Java APIs for files and datetimes.

Also, spent too much time on trying to pass a static (class level) method as a first-class function into `map`, as it requires an extra parentheses:

I have a strong feeling I'm doing something unidiomatic…

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