51 lines
No EOL
1,019 B
Elm
51 lines
No EOL
1,019 B
Elm
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module Set (empty,singleton,insert,remove
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,member
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,foldl,foldr,map
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,union,intersect,diff
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,toList,fromList
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) where
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import Dict
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import List
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type Set t = Dict t ()
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empty : Set t
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empty = Dict.empty
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singleton : t -> Set t
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singleton k = Dict.singleton k ()
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insert : t -> Set t -> Set t
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insert k = Dict.insert k ()
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remove : t -> Set t -> Set t
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remove = Dict.remove
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member : t -> Set t -> Bool
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member = Dict.member
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union : Set t -> Set t -> Set t
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union = Dict.union
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intersect : Set t -> Set t -> Set t
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intersect = Dict.intersect
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diff : Set t -> Set t -> Set t
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diff = Dict.diff
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toList : Set t -> [t]
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toList = Dict.keys
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fromList : [t] -> Set t
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fromList xs = List.foldl (\k t -> Dict.insert k () t) empty xs
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foldl : (a -> b -> b) -> b -> Set a -> b
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foldl f b s = Dict.foldl (\k _ b -> f k b) b s
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foldr : (a -> b -> b) -> b -> Set a -> b
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foldr f b s = Dict.foldr (\k _ b -> f k b) b s
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map : (a -> b) -> Set a -> Set b
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map f s = fromList (List.map f (toList s)) |