How does one detect a change in a doseq?
I'm trying to do what data processing people would call a control break in
a report. I'm printing account + fund names. My data is sorted by
account, so each row has a new fund, and accounts change less frequently.
I'd like to print a separator line when account changes. In a procedural
language, I'd set up an old-account variable, and I'd print the separator
line when account != old-account.
(doseq [h list-of-account-fund-pairs]
(let [account (first h)
fund (second h)
* (if changed-account)*
(println "-----------")
(println account fund)
Thanks!
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