(def arr (array :a [:b :c] :d)) # => @[:a (:b :c) :d] (0 arr) # => :a (1 arr) # => (:b :c) # out-of-bounds access causes an error (try (3 arr) ([err] err)) # => "expected integer key for array in range [0, 3), got 3" # you may use `get` to avoid the error (get arr 3) # => nil