On Jul 19, 12:53 pm, Richard Newman <holyg...@gmail.com> wrote:
> > * Can the body of the db-push function be simplified?
>
> I think so. Untested:
>
> (defn db-push
>   ([key val] (db-push key val *default-db*))
>   ([key val db]
>      (swap! db assoc key (cons val (db key))))))

If I add an @ it runs:

(defn db-push
  ([key val] (db-push key val *default-db*))
  ([key val db]
     (swap! db assoc key (cons val (@db key)))))

But I think it's broken in the face of concurrency, as I capture the
value of @db at the time of the call to the function swap!

Actually using an ' instead of the @ seems to work:

(defn db-push
  ([key val] (db-push key val *default-db*))
  ([key val db]
     (swap! db assoc key (cons val ('db key)))))

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