function
boot.janet on line 1302, column 1
(has-value? ds value)
Check if a data structure `ds` contains the value `value`. Will run
in time proportional to the size of `ds`.
(defn array-difference [array-1 array-2]
(filter |(not (has-value? array-2 $)) array-1))
(array-difference [1 2 3 4 5] [2 3 4]) # => @[1 5]