Hello,
Being new to Clojure, to Lisp and to functional programming in
general, I have some trouble wraping my head around it.
As the first exercice, I would like to print multiplication table of
specified order, like:
(print-multiplication-table 3)
1 2 3
2 4 6
3 6 9
I came that far:
(defn multiplication-row [n k]
(map (partial * k) (range 1 (inc n))))
(defn multiplication-table [n]
(map (partial multiplication-row n) (range 1 (inc n))))
(println (multiplication-table 3)) ; => ((1 2 3) (2 4 6) (3 6 9))
Now, how to pretty print this?
This does not work - prints nothing - why?:
(defn pretty-print-row [row]
(map print row))
This also does not work - throws
java.lang.UnsupportedOperationException: Can only recur from tail
position (hello_world.clj:47) - why?:
(defn pretty-print-row [row]
(if (first row)
((print (first row))
(recur (rest row)))))
Once I remove print expression, exception is not thrown (what the
heck?)
Regards,
Piotrek
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