Day eight: Tuple sections :3

day-08-haskell/src/Common.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE TupleSections #-}
 module Common where
 
 import Data.Foldable (toList)
@@ -11,7 +12,7 @@ pairPermutations :: [a] -> [(a, a)]
 pairPermutations [] = []
 pairPermutations [_] = []
 pairPermutations [x, y] = pure (x, y)
-pairPermutations (x:xs) = map (\y -> (x, y)) xs ++ pairPermutations xs
+pairPermutations (x:xs) = map (x,) xs ++ pairPermutations xs
 
 type Position = (Int, Int)
 type Antenna = (Char, Position)