Here are a couple of vector functions.
When you use “map” on a vector, you get a list back.
user.core=> (map inc [1 2 3]) (2 3 4) user.core=> (class (map inc [1 2 3])) clojure.lang.LazySeq
It acts like a list (because for lists “conj” adds at the front; for vectors it adds at the end).
user.core=> (conj (map inc [1 2 3]) 5) (5 2 3 4)
Calling “vector” on it gives you a vector with a list inside it.
user.core=> (vector (map inc [1 2 3])) [(2 3 4)]
So call “vec” on the result to make it a vector.
user.core=> (vec (map inc [1 2 3])) [2 3 4]
“vector” can take elements directly.
user.core=> (vector 1 2 3) [1 2 3]
“vec” must take a collection.
user.core=> (vec 1 2 3)
ArityException Wrong number of args (3) passed to: core/vec clojure.lang.AFn.throwArity (AFn.java:429)
user.core=> (vec '(1 2 3))
[1 2 3]
user.core=> (vec #{1 2 3})
[1 3 2]
Same with “set”.
user.core=> (set 1 2 3)
ArityException Wrong number of args (3) passed to: core/set clojure.lang.AFn.throwArity (AFn.java:429)
user.core=> (vec #{1 2 3} 'a)
ArityException Wrong number of args (2) passed to: core/vec clojure.lang.AFn.throwArity (AFn.java:429)
user.core=> (vec #{1 2 3} '(:a :b "hello"))
ArityException Wrong number of args (2) passed to: core/vec clojure.lang.AFn.throwArity (AFn.java:429)
You’re welcome.