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authorJoris2020-01-30 11:35:31 +0000
committerJoris2020-01-30 11:35:31 +0000
commit960fa7cb7ae4c57d01306f78cd349f3a8337d0ab (patch)
tree5077cc720525fb025e4dba65a9a8b631862cbcc8 /src/client/Utils/List.elm
parent14bdbc8c937f5d0b35c61350dba28cb41c3737cd (diff)
parent6a04e640955051616c3ad0874605830c448f2d75 (diff)
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Merge branch 'with-ghcjs' into 'master'
Use Haskell on the frontend See merge request guyonvarch/shared-cost!2
Diffstat (limited to 'src/client/Utils/List.elm')
-rw-r--r--src/client/Utils/List.elm36
1 files changed, 0 insertions, 36 deletions
diff --git a/src/client/Utils/List.elm b/src/client/Utils/List.elm
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--- a/src/client/Utils/List.elm
+++ /dev/null
@@ -1,36 +0,0 @@
-module Utils.List exposing
- ( groupBy
- , mean
- , links
- )
-
-import Dict
-import Maybe.Extra as Maybe
-
-groupBy : (a -> comparable) -> List a -> List (comparable, List a)
-groupBy f xs =
- let addItem item dict =
- let groupItems = Dict.get (f item) dict |> Maybe.withDefault []
- in Dict.insert (f item) (item :: groupItems) dict
- in List.foldr addItem Dict.empty xs
- |> Dict.toList
-
-mean : List Int -> Int
-mean xs = (List.sum xs) // (List.length xs)
-
-links : List a -> List (a, a)
-links xs =
- let reversed = List.reverse xs
- in List.foldr
- (\x acc ->
- case Maybe.map Tuple.first (List.head acc) of
- Just y ->
- (x, y) :: acc
- _ ->
- acc
- )
- (case reversed of
- x :: y :: _ -> [(y, x)]
- _ -> []
- )
- (List.reverse << List.drop 2 <| reversed)