How to use resolved variable in clojure

Asked Jul 04 '17 at 11:57

Active Jul 04 '17 at 13:26

Viewed 96 times

I can't manage to resolve a variable and use it. The problem seems trivial so most likely I missed it when reading the tutorials:

(def v 42)            ;=> #'user/v
(+ v 1)               ;=> 43
(+ (resolve 'v) 1)    ;ClassCastException clojure.lang.Var cannot be cast to java.lang.Number

However this works:

(defn w [] 4)         ;=> #'user/w
(+ (w) 1)             ;=> 5
(+ ((resolve 'w)) 1)  ;=> 5

edited Jul 04 '17 at 13:26

asked Jul 04 '17 at 11:57

Midiparse

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you need to dereference it: `(+ @(resolve 'v) 1)` or `(+ (deref (resolve 'v)) 1)` – leetwinski Jul 04 '17 at 12:05
Thanks for the help. – Midiparse Jul 04 '17 at 12:37
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@leetwinski why on earth didn't you make that an answer to the question? – Brandon Henry Jul 04 '17 at 16:46
@leetwinski please answer the question. – Midiparse Jul 05 '17 at 07:22
I applied the dupe hammer, because the answer to that question answers this one, though the wording is a little different. @Midiparse if you think this question needs a different answer let me know and I'll un-dupe it. – Arthur Ulfeldt Jul 05 '17 at 17:45
I think it's appropriate, that answers this one, no need for a duplicate answer. – Midiparse Jul 05 '17 at 18:31

How to use resolved variable in clojure

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