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39 lines
758 B
Text
39 lines
758 B
Text
module Sublist exposing (..)
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version : Int
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version =
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2
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type ListComparison
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= Equal
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| Superlist
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| Sublist
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| Unequal
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sublist : List a -> List a -> ListComparison
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sublist alist blist =
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if alist == blist then
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Equal
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else if inList alist blist then
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Superlist
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else if inList blist alist then
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Sublist
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else
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Unequal
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inList : List a -> List a -> Bool
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inList alist blist =
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let
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getLastInList sublist =
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Maybe.withDefault [] (List.tail sublist)
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in
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if (List.length alist) < (List.length blist) then
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False
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else if (List.take (List.length blist) alist) == blist then
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True
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else
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inList (getLastInList alist) blist
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