diff options
| author | Determinant <ted.sybil@gmail.com> | 2017-05-28 20:29:11 -0400 |
|---|---|---|
| committer | Determinant <ted.sybil@gmail.com> | 2017-05-28 20:29:11 -0400 |
| commit | 9c608c32a9387a1dd1cb045e5822733ad181ccf8 (patch) | |
| tree | 9464fd3f8e218c6000783c80e2db7b573c30ea80 /11-20/20.hs | |
| parent | b2d6f0e28dac922ac4ed5c55f79d0dd38f4765d2 (diff) | |
finish vol 2
Diffstat (limited to '11-20/20.hs')
| -rw-r--r-- | 11-20/20.hs | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/11-20/20.hs b/11-20/20.hs new file mode 100644 index 0000000..c6a3ba8 --- /dev/null +++ b/11-20/20.hs @@ -0,0 +1,6 @@ +removeAt :: Int -> [a] -> (Maybe a, [a]) + +removeAt k (x:xs) + | k > 1 = let (a, b) = removeAt (k - 1) xs in (a, x:b) + | k == 1 = (Just x, xs) +removeAt _ l = (Nothing, l) |