On Sat, May 23, 2009 at 11:41 AM, David Nolen <[email protected]> wrote:
>
> Put them in a namespace.
>
> (ns prime-seive)
>
> ... definitions ...
Yes, this would probably be best. Then you can use 'defn-' instead of 'defn'
for all the function definitions that you want to keep private.
Another option that is usually less desirable, but a good choice in some
situations, is to move the functions you want to keep private into locals:
(defn count-reversible [rev-max]
(let [all-odd? (fn ...)
reverse-num (fn ...)
...and so on...]
{:max rev-max, :num-reversible ...}))
This is generally not as nice because it makes updating the definitions while
running more difficult, requires deeper nesting, separates the count-reversible
args from its body, etc. But it does give you absolute protection from someone
calling one of the private functions.
There's a nice blog post here that covers several options for how to put
together related functions:
http://programming-puzzler.blogspot.com/2009/04/adts-in-clojure.html
--Chouser
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