Yes! That does help. It's complaining about the arity of the function in
the map, not the reformat-headers function. Now I understand. Thank you
very much for helping clarify it for me.
Dave
On Saturday, June 29, 2013 8:30:21 PM UTC-5, Baishampayan Ghose wrote:
>
> What is the shape of `headers`? It looks like headers is a sequence of
> two-element sequences, in which case `reformat-headers` should be
> something like this -
>
> (defn reformat-headers
> [headers]
> (map (fn [[x y]] (hash-map [x 0] (.toString [y 1]))) headers))
> ;; note the destructuring.
>
> The problem is, the lambda inside the map is expecting two args but is
> getting one arg (which is a two element sequence) instead.
>
> Hope that helps.
>
> ~BG
>
>
>
> On Sun, Jun 30, 2013 at 6:49 AM, Dave Kincaid
> <kincai...@gmail.com<javascript:>>
> wrote:
> > Here is the whole thing:
> >
> > (defn reformat-headers
> > [headers]
> > (debug (str "Reformatting " headers))
> > (map #(hash-map [%1 0] (.toString [%2 1])) headers))
> >
> > (defn spit-messages
> > "Write out the messages in the given seq."
> > [messages dest]
> > (pprint
> > (for [[metadata ^bytes payload] messages]
> > {:header (update-in metadata [:headers] reformat-headers) :payload
> > (String. payload)})
> > dest))
> >
> >
> > On Saturday, June 29, 2013 8:12:26 PM UTC-5, Baishampayan Ghose wrote:
> >>
> >> This should work. What does headers look like? Sometimes the #(...)
> >> reader form can cause problems. Does using the (fn ...) form help? ~BG
> >>
> >> On Sun, Jun 30, 2013 at 5:39 AM, Dave Kincaid <kincai...@gmail.com>
> wrote:
> >> > Could someone help me decipher the ArityException I'm getting. It's
> not
> >> > making sense to me. First here is the exception:
> >> >
> >> > ArityException Wrong number of args (1) passed to:
> >> > lastN$reformat-headers$fn
> >> > clojure.lang.AFn.throwArity (AFn.java:437)
> >> >
> >> > and here is the function reformat-headers:
> >> >
> >> > (defn reformat-headers
> >> > [headers]
> >> > (map #(.toString %) headers))
> >> >
> >> > as far as I can tell the exception is saying that 1 argument is the
> >> > wrong
> >> > number of arguments for reformat-headers, but as you can clearly see
> it
> >> > is a
> >> > function of one argument. What am I interpreting wrong?
> >> >
> >> > Thanks,
> >> >
> >> > Dave
> >> >
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> >> Baishampayan Ghose
> >> b.ghose at gmail.com
> >
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> --
> Baishampayan Ghose
> b.ghose at gmail.com
>
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