Hi Stuart,
I believe you might looking for zipmap:
-------------------------
clojure.core/zipmap
([keys vals])
Returns a map with the keys mapped to the corresponding vals.
This is used as follows:
user=> (zipmap [:a :b :c] [[1 2] [3 4] [5 6]])
{:c [5 6], :b [3 4], :a [1 2]}
There are a lot of handy functions like this in core but you really need to
know they exist before you can use them. Discovering new ones is always
exciting!
Sam
---
http://sam.aaron.name
On 17 Jan 2011, at 16:56, Stuart Popejoy wrote:
> Greetings,
>
> Apologies if this seems like a pointless question but a) searches were
> fruitless and b) hopefully this is interesting to consider ...
>
> I'm wanting to create a map from two seqs (:keys and values), and it
> seems surprisingly tricky.
>
> I would rather not use hash-map, but if I did the following would
> suffice:
>
> => (apply hash-map (apply concat (map vector [:a :b :c] [[1 2] [2 3]
> [3 4]])))
> {:a [1 2], :c [3 4], :b [2 3]}
>
> The quick answer would be a function equivalent to {} in the place of
> hash-map above, but I can't find such a thing.
>
> My two answers are:
> a) compose assoc functions:
> => ((apply comp (map #(fn [m] (assoc m % %2)) [:a :b :c] [[1 2] [2 3]
> [3 4]])) nil)
> {:a [1 2], :b [2 3], :c [3 4]}
>
> b) recursion:
> => (loop [[k & ks] [:a :b :c] [v & vs] [[1 2] [2 3] [3 4]] m {}] (if
> (not k) m (recur ks vs (assoc m k v))))
> {:c [3 4], :b [2 3], :a [1 2]}
>
> Both seem wizzy/overly complex. I should probably just use hash-
> map ... but am I missing some elegant way to perform this with vanilla
> map?
>
> Thanks,
> Stuart
>
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