Hi, today I needed to use the map function on multiple collections
which didn't had all the same length. In this case, it returns a
sequence of the size of smallest one. But the problem I was facing was
required to map until the end of the longest, padding the smaller ones
with a default value. I came up with this:
(defn mappad [f val & colls]
(let [longest (apply max (map count colls))
colls (map #(if (< (count %) longest)
(concat % (repeat val))
%) colls)]
(apply (partial map f) colls)))
user> (mappad #(+ %1 %2 %3) 0 [1] [2 3] [4 5 6])
(7 8 6)
Is there a better way?
- budu
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