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isSubsequenceOf :: Eq a => [a] -> [a] -> Boollistsafe Data.List.Safe The isSubsequenceOf function takes two lists and returns True if all the elements of the first list occur, in order, in the second. The elements do not have to occur consecutively. isSubsequenceOf x y is equivalent to x `elem` (subsequences y). Note: isSubsequenceOf is often used in infix form.
Examples
>>> "GHC" `isSubsequenceOf` "The Glorious Haskell Compiler" True
>>> ['a','d'..'z'] `isSubsequenceOf` ['a'..'z'] True
>>> [1..10] `isSubsequenceOf` [10,9..0] False
For the result to be True, the first list must be finite; for the result to be False, the second list must be finite:>>> [0,2..10] `isSubsequenceOf` [0..] True
>>> [0..] `isSubsequenceOf` [0,2..10] False
>>> [0,2..] `isSubsequenceOf` [0..] * Hangs forever*
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listsafe Data.List.Safe 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"]
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Non-empty sequence Please see README.md
derivedSequence :: SequenceDerivable s i => Sequence s irelational-schemas Database.Custom.IBMDB2 No documentation available.
unsafeSpecifySequence :: TableDerivable s => (s -> i) -> Pi s i -> Sequence s irelational-schemas Database.Custom.IBMDB2 Unsafely specify sequence table.
derivedSequence :: SequenceDerivable s i => Sequence s irelational-schemas Database.Custom.MySQL No documentation available.
unsafeSpecifySequence :: TableDerivable s => (s -> i) -> Pi s i -> Sequence s irelational-schemas Database.Custom.MySQL Unsafely specify sequence table.
derivedSequence :: SequenceDerivable s i => Sequence s irelational-schemas Database.Custom.Oracle No documentation available.
unsafeSpecifySequence :: TableDerivable s => (s -> i) -> Pi s i -> Sequence s irelational-schemas Database.Custom.Oracle Unsafely specify sequence table.
derivedSequence :: SequenceDerivable s i => Sequence s irelational-schemas Database.Custom.PostgreSQL No documentation available.