This exception tip is a bit confusing.
(assoc [] :a 3)
>
>
> IllegalArgumentException Key must be integer
> clojure.lang.APersistentVector.assoc (APersistentVector.java:347)
>
>
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Vector keys must be integers. Try
(assoc [] 0 :a)
A vector has keys from 0 to (count vector) pointing to elements at the same
index. It's more like an Array list in this way.
What you're doing would need a map instead. Try
(assoc {} :a 0)
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