Why isn't the following satisfactory for your needs? get-value takes a value
returns a new value based on it. do-something can 'do something' to/with
this new value.
(defn get-value [start-value]
(loop [updateable start-value line (.readline reader)]
(if (or (empty? line) (> line-num max-num))
(+ updateable (somefunc))
(recur (.readLine reader)))))
(defn do-something []
(let [updated-value (get-value 0)]
(println updated-value))
On Thu, Jun 11, 2009 at 2:21 PM, Berlin Brown <[email protected]>wrote:
>
>
>
> On Jun 11, 12:16 pm, Daniel Lyons <[email protected]> wrote:
> > On Jun 11, 2009, at 9:25 AM, BerlinBrown wrote:
> >
> >
> >
> > > I do this a lot but can't figure out to change the UPDATEABLE_VALUE, I
> > > am using some pseudo code because I don't have a clojure solution yet.
> >
> > > SET UPDATEABLE_VALUE = 0
> > > (loop [line (.readLine reader)]
> > > (if (or (empty? line) (> line-num max-num))
> > > SET UPDATEABLE_VALUE = UPDATEABLE_VALUE + (SOME_FUNC)
> > > (recur (.readLine reader))))
> >
> > In general it's going to be something like this:
> >
> > (loop [line (.readLine reader) UPDATEABLE_VALUE 0]
> > (if (or (empty? line) (> line-num max-num))
> > (recur (.readLine reader) (+ UPDATEABLE_VALUE (SOME_FUNC)))))
> >
> > Whenever you would have modified a local variable before, in FP you
> > establish a new binding instead.
> >
> > —
> > Daniel Lyonshttp://www.storytotell.org-- Tell It!
>
> I can modify the value within the loop, but what is a good approach
> for accessing the value outside of the loop. For example (pseudo code
> with a mix of procedural logic).
>
> ;; Init updateable value outside of 'loop'
> SET UPDATEABLE_VALUE = 0
> (loop [line (.readLine reader)]
> (if (or (empty? line) (> line-num max-num))
> SET UPDATEABLE_VALUE = UPDATEABLE_VALUE + (SOME_FUNC)
> (recur (.readLine reader))))
> ;; Now outside of the loop, use UPDATEABLE_VALUE with the mutated
> value
> (println UPDATEABLE_VALUE)
>
>
>
> >
>
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