Partition the data. At its simplest:
(doseq [accounts (partition-by first account-funds)]
(doseq [account (first h), fund (second h)]
(println account fund)
(println "-----------"))))
You can also use destructuring to do without the let clause:
(doseq [accounts (partition-by first account-funds)]
(doseq [[account fund] accounts]
(println account fund)
(println "-----------")))
And we can merge the two doseqs:
(doseq [accounts (partition-by first account-funds), [account fund]
accounts]
(println account fund)
(println "-----------"))
On 15 July 2017 at 23:18, Kevin Kleinfelter <[email protected]>
wrote:
> 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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--
James Reeves
booleanknot.com
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