On Sunday 30 November 2008 09:06, Randall R Schulz wrote:
> Hi,
>
> This is my first Clojure how-to question. I tried to find an answer
> on the Wiki and in the list archives, but to no avail.
>
> How do I build up a map one association at a time? Clearly (map ...)
> won't do that, 'cause the output has as many elements as the input. I
> looked at (reduce ...) but can't see how to make that work. The only
> piece of the puzzle I can see being involved is (assoc ...).
>
> Can I get some hints? Do I need to be more specific about where the
> pairs I'll be adding come from? Is it sufficient to say that the
> input is a sequence, each element of which will yield another pair to
> add to the complete map I want to return?
Ha! I think I got it. (I've got something that works, anyway):
(ns rrs.ns-ctags
(:use clojure.contrib.ns-utils))
(defn ns-var-metas
"Acquire a map from Var names to their respective metadata
maps for each public Var in the specified namespace"
[ns-name]
(let [namespace (find-ns ns-name)]
(loop [ns-vars (ns-vars namespace)
var-map {}]
(let [ns-var (first ns-vars)]
(if (seq ns-vars)
(recur (rest ns-vars)
(assoc var-map ns-var (meta (ns-resolve ns-name ns-var))))
var-map))))
Critiques welcome.
Randall Schulz
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