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Add groupBy to Array.NonEmpty #164

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Merged
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Dec 28, 2020
Merged

Add groupBy to Array.NonEmpty #164

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12 changes: 12 additions & 0 deletions src/Data/Array/NonEmpty.purs
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Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,9 @@ module Data.Array.NonEmpty
, dropEnd
, dropWhile
, span
, group
, group'
, groupBy

, nub
, nubBy
Expand Down Expand Up @@ -339,6 +342,15 @@ span
-> { init :: Array a, rest :: Array a }
span f = adaptAny $ A.span f

group :: forall a. Eq a => NonEmptyArray a -> NonEmptyArray (NonEmptyArray a)
group = unsafeAdapt $ A.group

group' :: forall a. Ord a => NonEmptyArray a -> NonEmptyArray (NonEmptyArray a)
group' = unsafeAdapt $ A.group'

groupBy :: forall a. (a -> a -> Boolean) -> NonEmptyArray a -> NonEmptyArray (NonEmptyArray a)
groupBy op = unsafeAdapt $ A.groupBy op

nub :: forall a. Ord a => NonEmptyArray a -> NonEmptyArray a
nub = unsafeAdapt A.nub

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12 changes: 12 additions & 0 deletions test/Test/Data/Array/NonEmpty.purs
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Expand Up @@ -234,6 +234,18 @@ testNonEmptyArray = do
let oneToSeven = fromArray [1, 2, 3, 4, 5, 6, 7]
testSpan { p: (_ < 4), input: oneToSeven, init_: [1, 2, 3], rest_: [4, 5, 6, 7] }

log "group should group consecutive equal elements into arrays"
assert $ NEA.group (fromArray [1, 2, 2, 3, 3, 3, 1]) == fromArray [NEA.singleton 1, fromArray [2, 2], fromArray [3, 3, 3], NEA.singleton 1]

log "group' should sort then group consecutive equal elements into arrays"
assert $ NEA.group' (fromArray [1, 2, 2, 3, 3, 3, 1]) == fromArray [fromArray [1, 1], fromArray [2, 2], fromArray [3, 3, 3]]

log "groupBy should group consecutive equal elements into arrays based on an equivalence relation"
assert $ NEA.groupBy (\x y -> odd x && odd y) (fromArray [1, 1, 2, 2, 3, 3]) == fromArray [fromArray [1, 1], NEA.singleton 2, NEA.singleton 2, fromArray [3, 3]]

log "groupBy should be stable"
assert $ NEA.groupBy (\_ _ -> true) (fromArray [1, 2, 3]) == fromArray [fromArray [1, 2, 3]]

log "nub should remove duplicate elements from the list, keeping the first occurence"
assert $ NEA.nub (fromArray [1, 2, 2, 3, 4, 1]) == fromArray [1, 2, 3, 4]

Expand Down