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About: http://clojure.org/about/spec Guide: http://clojure.org/guides/spec API: https://clojure.github.io/spec.alpha/clojure.spec.alpha-api.html
konrad szydlo 2020-12-10T12:58:40.480500Z
Hi, I'm trying to figure out how to implement xor for a map keys. Where I'd like to check if one of the keys is present but not both at the same time.
(s/def ::a int?)
(s/def ::b int?)
(s/def ::c string?)::a xor ::b
{::a 1 ::b 2 ::c "string"} ;; both ::a and ::b present
and the following maps are valid:
{::a 1 ::c "string"}
{::b 2 ::c "string"}
vlaaad 2020-12-10T14:12:01.481200Z
(s/and (s/keys ...) #(= 2 (count (select-keys % [::a ::b ::c]))))?
english 2020-12-10T14:12:03.481300Z
s/keys only supports regular or: https://stackoverflow.com/a/41901585
but you could combine the s/keys spec with a custom xor spec via s/and, as described in https://stackoverflow.com/a/43374087
konrad szydlo 2020-12-10T14:45:55.481700Z
Thank you. My searching on duck duck go didn't return this answer from SO. That's what I was looking for.
In the docs for s/keys I saw that or is supported but not xor