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-- likelion | |
-- haskell 함수를 구현 | |
-- fst | |
fst' :: (a,b) -> a | |
fst' (a, _) = a | |
-- snd | |
snd' :: (a,b) -> b | |
snd' (_, b) = b | |
-- succ | |
-- succ' :: a -> a | |
succ' a = a + 1 | |
-- min | |
min' :: (Ord a) => a -> a -> a | |
min' a b | |
| a > b = b | |
| otherwise = a | |
-- max | |
max' :: (Ord a) => a -> a -> a | |
max' a b | |
| a > b = a | |
| otherwise = b | |
-- && | |
True &&& b = b | |
False &&& _ = False | |
-- || | |
True ||| _ = True | |
False ||| b = b | |
-- == | |
(===) a b | a == b = True | |
| otherwise = False | |
-- /= | |
(/==) a b | a == b = False | |
| otherwise = True | |
-- ++ | |
(+++) :: [a] -> [a] -> [a] | |
[] +++ ys = ys | |
(x:xs) +++ ys = x : (xs +++ ys) | |
-- !! | |
-- > | |
(>!) a b | a > b = True | |
| otherwise = False | |
-- < | |
(<!) a b | a < b = True | |
| otherwise = False | |
-- head | |
head' :: [a] -> a | |
head' (x:xs) = x | |
-- tail | |
tail' :: [a] -> [a] | |
tail' (x:xs) = xs | |
-- last | |
last' :: [a] -> a | |
last' [x] = x | |
last' (x:xs) = last' xs | |
-- init | |
init' :: [a] -> [a] | |
init' [_] = [] | |
init' (x:xs) = x : init' xs | |
-- length | |
length' [] = 0 | |
length' (x:xs) = 1 + length' xs | |
-- null | |
-- reverse | |
reverse' (x:xs) = last (x:xs) : reverse (init (x:xs)) | |
-- take | |
take' :: Int -> [a] -> [a] | |
take' 0 xs = [] | |
take' _ [] = [] | |
take' n (x:xs) = x : take' (n-1) xs | |
-- drop | |
drop' :: Int -> [a] -> [a] | |
drop' 0 xs = xs | |
drop' _ [] = [] | |
drop' n (x:xs) = drop' (n-1) xs | |
-- maximum | |
maximum' :: (Ord a, Foldable t) => t a -> a | |
maximum' = foldl1 max | |
-- mininum | |
mininum' :: (Ord a, Foldable t) => t a -> a | |
mininum' = foldl1 min | |
-- sum | |
sum' [] = 0 | |
sum' (x:xs) = x + sum' xs | |
-- product | |
product' [] = 0 | |
product' (x:xs) = x * product' xs | |
-- elem | |
elem' :: Eq a => a -> [a] -> Bool | |
elem' n [] = False | |
elem' n (x:xs) = if n==x then True else elem' n xs | |
-- zip | |
zip' :: [a] -> [b] -> [(a,b)] | |
zip' [] _ = [] | |
zip' _ [] = [] | |
zip' (x:xs) (y:ys) = (x,y) : zip' xs ys | |
-- quicksort | |
f [] = [] | |
f (x:xs) = f smaller ++ [x] ++ larger | |
where | |
smaller = [a | a <- xs, a <= x] | |
larger = [b | b <- xs, b > x] | |
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