'keycollect-partition' looks sensible and idiomatic to me... perhaps
juxt can come into play here? Of course, both versions will only work
with keys as keywords and non-keys as non-keywords. If you use anything
else other than a keyword for a key or a keyword for an item, both will
break...
Jim
On 20/02/13 11:50, Stefan Kamphausen wrote:
Hi,
given a vector of the form
[:key1 1 2 3 :key2 4 :key3 5 6 7]
I wand to create a map collecting the items behind each keyword as a vector
like this:
{:key1 [1 2 3]
:key2 [4]
:key3 [5 6 7]}
I have already written two functions which achieve this, but neither of them "feels
good" and I am interested in more elegant and idiomatic solutions.
(defn keycollect-partition [coll]
(->> coll
(partition-by keyword?) ; bundle at key
(partition 2) ; kw + its arg
(map (fn [[[sec] arg]] [sec (vec arg)])) ; destruct the mess
(into {}))) ; make it a map
(defn keycollect-reduce [coll]
(apply zipmap
(reduce
(fn [ac x]
(if (keyword? x)
[(conj (first ac) x) (conj (second ac) [])]
(update-in ac [1 (dec (count (first ac)))] conj x))) [[] []]
coll)))
Added complexity: My original vector does not yet contain keywords, but I
construct them in amap regexp-matching each item and creating a keyword from
the first group of the match.
Any pointers or ideas appreciated.
Regards,
Stefan
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