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Within LTS Haskell 24.6 (ghc-9.10.2)
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enumFromThen :: Enum a => a -> a -> [a]base GHC.Enum 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]base GHC.Enum 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]base GHC.Enum 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] = []
enumerate :: Location -> [Location]doctest Test.DocTest.Internal.Location Create a list from a location, by repeatedly increasing the line number by one.
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conduit Conduit Enumerate from a value to a final value, inclusive, via succ. This is generally more efficient than using Prelude's enumFromTo and combining with sourceList since this avoids any intermediate data structures.
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conduit Data.Conduit.Combinators Enumerate from a value to a final value, inclusive, via succ. This is generally more efficient than using Prelude's enumFromTo and combining with sourceList since this avoids any intermediate data structures. Subject to fusion
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conduit Data.Conduit.Internal No documentation available.
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conduit Data.Conduit.Internal.List.Stream No documentation available.
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conduit Data.Conduit.Internal.List.Stream No documentation available.
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conduit Data.Conduit.List Enumerate from a value to a final value, inclusive, via succ. This is generally more efficient than using Prelude's enumFromTo and combining with sourceList since this avoids any intermediate data structures. Subject to fusion Since 0.4.2