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Within LTS Haskell 24.6 (ghc-9.10.2)
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base Data.List The subsequences function returns the list of all subsequences of the argument.
Laziness
subsequences does not look ahead unless it must:>>> take 1 (subsequences undefined) [[]] >>> take 2 (subsequences ('a' : undefined)) ["","a"]
Examples
>>> subsequences "abc" ["","a","b","ab","c","ac","bc","abc"]
This function is productive on infinite inputs:>>> take 8 $ subsequences ['a'..] ["","a","b","ab","c","ac","bc","abc"]
bisequenceA_ :: (Bifoldable t, Applicative f) => t (f a) (f b) -> f ()base Data.Bifoldable Alias for bisequence_.
bisequence_ :: (Bifoldable t, Applicative f) => t (f a) (f b) -> f ()base Data.Bifoldable Evaluate each action in the structure from left to right, and ignore the results. For a version that doesn't ignore the results, see bisequence.
Examples
Basic usage:>>> bisequence_ (print "Hello", print "World") "Hello" "World"
>>> bisequence_ (Left (print "Hello")) "Hello"
>>> bisequence_ (Right (print "World")) "World"
bisequence :: (Bitraversable t, Applicative f) => t (f a) (f b) -> f (t a b)base Data.Bitraversable Sequences all the actions in a structure, building a new structure with the same shape using the results of the actions. For a version that ignores the results, see bisequence_.
bisequence ≡ bitraverse id id
Examples
Basic usage:>>> bisequence (Just 4, Nothing) Nothing
>>> bisequence (Just 4, Just 5) Just (4,5)
>>> bisequence ([1, 2, 3], [4, 5]) [(1,4),(1,5),(2,4),(2,5),(3,4),(3,5)]
bisequenceA :: (Bitraversable t, Applicative f) => t (f a) (f b) -> f (t a b)base Data.Bitraversable Alias for bisequence.
InvalidSequence :: CodingProgressbase GHC.IO.Encoding Stopped because there are sufficient free elements in the output to output at least one encoded ASCII character, but the input contains an invalid or unrepresentable sequence
InvalidSequence :: CodingProgressbase GHC.IO.Encoding.Types Stopped because there are sufficient free elements in the output to output at least one encoded ASCII character, but the input contains an invalid or unrepresentable sequence
getSequenced :: Sequenced a (m :: Type -> Type) -> m alens Control.Lens.Internal.Fold No documentation available.
subsequence :: MonadGen m => [a] -> m [a]hedgehog Hedgehog.Gen Generates a random subsequence of a list. For example:
Gen.print (Gen.subsequence [1..5])
=== Outcome === [1,2,4] === Shrinks === [] [2,4] [1,4] [1,2]
subsequence :: MonadGen m => [a] -> m [a]hedgehog Hedgehog.Internal.Gen Generates a random subsequence of a list. For example:
Gen.print (Gen.subsequence [1..5])
=== Outcome === [1,2,4] === Shrinks === [] [2,4] [1,4] [1,2]