Clojure 1.5.1.
I'm trying to reorder a map. The keys in the map are known beforehand and
their order is undefined. So, I'm taking this map and construct a new
transient map with the keys ordered as I need them:
defn reorder-map []
(let [
m {:j 10 :g 7 :b 2 :d 4 :e 5 :h 8 :i 9 :f 6 :c 3 :a 1 }
kwds [:a :b :c :d :e :f :g :h :i :j]
temp (transient {})
]
(doseq [k kwds]
(assoc! temp k (m k)))
(persistent! temp)))
It returns {:a 1, :b 2, :c 3, :d 4, :e 5, :f 6, :g 7, :h 8}. The order is
as I have defined, but there are *only 8 out of 10 items* in the new map.
If I do the same with an atom, all items are taken into account, but the
order is not as expected:
(defn reorder-map-2 []
(let [
a (atom {})
m {:j 10 :g 7 :b 2 :d 4 :e 5 :h 8 :i 9 :f 6 :c 3 :a 1 }
kwds [:a :b :c :d :e :f :g :h :i :j]
]
(doseq [k kwds]
(swap! a assoc k (m k)))
@a))
It returns {:a 1, :c 3, :b 2, :f 6, :g 7, :d 4, :e 5, :j 10, :i 9, :h 8}
I don't know the internals to judge in which order items are associated in
a map. It seems that normal association prepends; transient association
appends; atom association does not obey any particular order.
Anyway,* it seems to be a bug in that the transient didn't accept more than
8 items*. It should, I suppose.
Or am I doing sth. very wrong?
Thank you -
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