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Rhywun (27) [Avatar] Offline
#1
The listing in the book is wrong. It blows the stack after I add the missing parenthesis at the end:

collatz 1 = 1
collatz n = if even n
            then 1 + collatz n `div` 2
            else 1 + (collatz n*3 + 1


It should be

collatz 1 = 1
collatz n = if even n
            then 1 + collatz (n `div` 2)
            else 1 + collatz (n * 3 + 1)
Will Kurt (21) [Avatar] Offline
#2
Thank you for this correction! I just made sure that this has been fixed in the final copy of the book