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added removeSubsequentDuplicates to Extra.elm #97

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added removeSubsequentDuplicates to Extra.elm #97

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16 changes: 15 additions & 1 deletion src/List/Extra.elm
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Original file line number Diff line number Diff line change
Expand Up @@ -84,14 +84,15 @@ module List.Extra
, greedyGroupsOf
, greedyGroupsOfWithStep
, groupsOfVarying
, removeSubsequentDuplicates
)

{-| Convenience functions for working with List


# Basics

@docs last, init, getAt, (!!), uncons, maximumBy, minimumBy, andMap, andThen, reverseMap, takeWhile, dropWhile, unique, uniqueBy, allDifferent, allDifferentBy, replaceIf, setAt, remove, updateIf, updateAt, updateIfIndex, removeAt, removeIfIndex, filterNot, swapAt, stableSortWith
@docs last, init, getAt, (!!), uncons, maximumBy, minimumBy, andMap, andThen, reverseMap, takeWhile, dropWhile, unique, uniqueBy, allDifferent, allDifferentBy, replaceIf, setAt, remove, updateIf, updateAt, updateIfIndex, removeAt, removeIfIndex, removeSubsequentDuplicates, filterNot, swapAt, stableSortWith


# List transformations
Expand Down Expand Up @@ -686,6 +687,19 @@ remove x xs =
y :: remove x ys


{-| Remove Adjacent Duplicates.

removeSubsequentDuplicates [ 1, 2, 2, 3, 2, 3, 3, 3, 1 ] == [ 1, 2, 3, 2, 3, 1 ]

-}
removeSubsequentDuplicates : List a -> List a
removeSubsequentDuplicates items =
List.Extra.group items
|> List.map (\x -> List.take 1 x)
|> List.concat



{-| Set a value in a list by index. Return the original list if the index is out of range.

setAt 0 42 [ 1, 2, 3 ] == [ 42, 2, 3 ]
Expand Down