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 <kleinfelter.gro...@gmail.com>
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!
>
> --
> You received this message because you are subscribed to the Google
> Groups "Clojure" group.
> To post to this group, send email to clojure@googlegroups.com
> Note that posts from new members are moderated - please be patient with
> your first post.
> To unsubscribe from this group, send email to
> clojure+unsubscr...@googlegroups.com
> For more options, visit this group at
> http://groups.google.com/group/clojure?hl=en
> ---
> You received this message because you are subscribed to the Google Groups
> "Clojure" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to clojure+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
>
--
James Reeves
booleanknot.com
--
You received this message because you are subscribed to the Google
Groups "Clojure" group.
To post to this group, send email to clojure@googlegroups.com
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
clojure+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
---
You received this message because you are subscribed to the Google Groups
"Clojure" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to clojure+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
