I was recently working on some toy recursion problems, when I ran into a
function that I can express simply using normaly recursion, but I can't
seem to convert it into a form that works nicely with loop/recur.
It's certainly not the right way to solve this problem, but I'm intrigued
to see what this pattern looks like with explicit tail calls:
Problem:
Extract a slice from a list
(slice [ 3 4 5 6 7 8 9 ] 2 4)
;=> [ 5 6 7 8 ]
Normal Recursive Solution:
(defn slice [[h & tail] s n]
(cond
(zero? n) nil
(zero? s) (cons h (slice tail s (dec n)))
:else (slice tail (dec s) n)))
What would the tail recursive version of this look like? can it retain the
nice readability of this form?
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