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Add Semigroup instance #11

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Add Semigroup instance #11

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1d84f7f
Add Semigroup instance
bsermons Jul 12, 2016
f9760e5
Add tests and make code consistent
bsermons Jul 12, 2016
8bff355
Use Alternative constraint for Semigroup
bsermons Jul 20, 2016
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3 changes: 3 additions & 0 deletions src/Data/NonEmpty.purs
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Expand Up @@ -92,3 +92,6 @@ instance foldableNonEmpty :: Foldable f => Foldable (NonEmpty f) where
instance traversableNonEmpty :: Traversable f => Traversable (NonEmpty f) where
sequence (a :| fa) = NonEmpty <$> a <*> sequence fa
traverse f (a :| fa) = NonEmpty <$> f a <*> traverse f fa

instance semigroupNonEmpty :: Alternative f => Semigroup (NonEmpty f a) where
append (a :| fa) (b :| fb) = NonEmpty a (fa <|> pure b <|> fb)
1 change: 1 addition & 0 deletions test/Main.purs
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Expand Up @@ -23,3 +23,4 @@ main = do
assert $ fold ("Hello" :| [" ", "World"]) == "Hello World"
assert $ oneOf (0 :| Nothing) == oneOf (0 :| Just 1)
assert $ second (1 :| 2 :| [3, 4]) == 2
assert $ (1 :| [2, 3]) <> (4 :| [5,6]) == 1 :| [2, 3, 4, 5, 6]