Hi,
I've been digging into the sources of Clojure and found frequencies.
There's the transient function and I thought I'd use it with a map and
conj. Why does this fail?
user=> (conj {} {:y 1})
{:y 1}
user=> (conj (transient {}) {:y 1})
ClassCastException [trace missing]
I ran into the issue before and got a more comprehensible exception.
ClassCastException clojure.lang.PersistentArrayMap$TransientArrayMap
cannot be cast to clojure.lang.IPersistentCollection
clojure.core/conj (core.clj:83)
I can't explain why the exception is reported in two different versions.
Should the exception be thrown? What's the rationale behind
TransientArrayMap *not* being a IPersistentCollection?
Jacek
--
Jacek Laskowski
Functional languages (Clojure), Java EE, and IBM WebSphere -
http://blog.japila.pl
"Never discourage anyone who continually makes progress, no matter how
slow." Plato
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