On Sun, Nov 30, 2008 at 12:06 PM, Randall R Schulz <[EMAIL PROTECTED]> wrote:
>
> 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 ...).
user=> (def seq-of-pairs (seq [[:a 1] [:b 2] [:c 3]]))
#'user/seq-of-pairs
user=> (into {} seq-of-pairs) ; best, most idiomatic
{:c 3, :b 2, :a 1}
user=> (apply conj {} seq-of-pairs) ; only if you'd never heard of into
{:c 3, :b 2, :a 1}
user=> (reduce conj {} seq-of-pairs) ; perhaps you want to do
something more than just conj
{:c 3, :b 2, :a 1}
user=> (reduce (fn [m [k v]] (assoc m k v)) {} seq-of-pairs) ; if you
really want to use assoc
{:c 3, :b 2, :a 1}
--Chouser
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