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Within LTS Haskell 24.51 (ghc-9.10.3)
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enumFromThen :: Enum a => a -> a -> [a]mixed-types-num Numeric.MixedTypes.PreludeHiding Used in Haskell's translation of [n,n'..] with [n,n'..] = enumFromThen n n', a possible implementation being enumFromThen n n' = n : n' : worker (f x) (f x n'), worker s v = v : worker s (s v), x = fromEnum n' - fromEnum n and
f n y | n > 0 = f (n - 1) (succ y) | n < 0 = f (n + 1) (pred y) | otherwise = y
Examples
enumFromThen 4 6 :: [Integer] = [4,6,8,10...]
enumFromThen 6 2 :: [Int] = [6,2,-2,-6,...,minBound :: Int]
enumFromThenTo :: Enum a => a -> a -> a -> [a]mixed-types-num Numeric.MixedTypes.PreludeHiding Used in Haskell's translation of [n,n'..m] with [n,n'..m] = enumFromThenTo n n' m, a possible implementation being enumFromThenTo n n' m = worker (f x) (c x) n m, x = fromEnum n' - fromEnum n, c x = bool (>=) ((x 0)
f n y | n > 0 = f (n - 1) (succ y) | n < 0 = f (n + 1) (pred y) | otherwise = y
andworker s c v m | c v m = v : worker s c (s v) m | otherwise = []
Examples
enumFromThenTo 4 2 -6 :: [Integer] = [4,2,0,-2,-4,-6]
enumFromThenTo 6 8 2 :: [Int] = []
enumFromTo :: Enum a => a -> a -> [a]mixed-types-num Numeric.MixedTypes.PreludeHiding Used in Haskell's translation of [n..m] with [n..m] = enumFromTo n m, a possible implementation being
enumFromTo n m | n <= m = n : enumFromTo (succ n) m | otherwise = []
Examples
enumFromTo 6 10 :: [Int] = [6,7,8,9,10]
enumFromTo 42 1 :: [Integer] = []
fromEnum :: Enum a => a -> Intmixed-types-num Numeric.MixedTypes.PreludeHiding Convert to an Int. It is implementation-dependent what fromEnum returns when applied to a value that is too large to fit in an Int.
-
mixed-types-num Numeric.MixedTypes.PreludeHiding Convert from an Int.
NamedEnumResolver :: TypeName -> NamedResolverResult (m :: Type -> Type)morpheus-graphql-app Data.Morpheus.App.Internal.Resolving No documentation available.
ResEnum :: TypeName -> ResolverValue (m :: Type -> Type)morpheus-graphql-app Data.Morpheus.App.Internal.Resolving No documentation available.
mkEnum :: forall (m :: Type -> Type) . TypeName -> ResolverValue mmorpheus-graphql-app Data.Morpheus.App.Internal.Resolving No documentation available.
enum :: forall (m :: Type -> Type) . TypeName -> ResolverValue mmorpheus-graphql-app Data.Morpheus.App.NamedResolvers No documentation available.
enumFromN :: Num a => a -> Int -> Maybe (NonEmptyVector a)nonempty-vector Data.Vector.NonEmpty O(n) Yield a non-emptyvector of the given length containing the values x, x+1 etc. This operation is usually more efficient than enumFromTo. If an enumeration does not use meaningful indices, Nothing is returned, otherwise, Just containing a non-empty vector.