On Sun, Jun 1, 2014 at 9:36 AM, Glen Mailer <glenja...@gmail.com> wrote:
> Hi everyone, I'm looking to get some opinions on code style.
>
> Specifically, I like to write my code in a top-down.
>
> What I mean by that is that within a file the highest-level functions sit
> at the top, and are implemented in terms of lower-level functions further
> down.
>
...
> The problem now is because of the single-pass nature of clojure's
> evaluation - simply writing code like this doesn't actually work.
>
> There's a few approaches i've seen from reading other's code:
>
> 1. Have an "impl" namespace which contains all of the helper functions for
> the public "interface"
> 2. Make use of (declare) forms where necessary to improve forward
> readability
> 3. Don't worry about source order, just have the api functions further
> down the file and live with it
>
4. Put your helper funcs ("defn-" stuff) in helpers.clj, without a call to
ns at the top, then (load "helpers") at the top of the file that uses them.
You still get the effect you're looking for, with a one line "preface"
that tells the reader where to look for more info. Seems to work in a
little test app (lein new app topdown):
;; in topdown/core.clj:
(ns topdown.core
(:gen-class))
(load "helpers")
(defn -main
"I don't do a whole lot, but I do call an internal function that lives in
another source file."
[& args]
(hello))
;; in topdown/helpers.clj:
;; internal topdown helper fns
(defn- hello [] (println "Hello"))
HTH
Gregg
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