2026-08-21
MyLength.hs
myLength :: [a] -> Int
myLength = undefined -- write this
Implement myLength without using the built-in length.
Reference
myLength :: [a] -> Int
myLength [] = 0
myLength (_:xs) = 1 + myLength xs
One equation per case: the empty list has length zero, and a non-empty list is one plus the length of its tail.