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Within LTS Haskell 24.62 (ghc-9.10.3)
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toList :: Foldable t => t a -> [a]fmlist Data.FMList List of elements of a structure, from left to right. If the entire list is intended to be reduced via a fold, just fold the structure directly bypassing the list.
Examples
Basic usage:>>> toList Nothing []
>>> toList (Just 42) [42]
>>> toList (Left "foo") []
>>> toList (Node (Leaf 5) 17 (Node Empty 12 (Leaf 8))) [5,17,12,8]
For lists, toList is the identity:>>> toList [1, 2, 3] [1,2,3]
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No documentation available.
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focuslist Data.FocusList A list with a given element having the Focus. FocusList has some invariants that must be protected. You should not use the FocusList constructor or the focusListFocus or focusList accessors. Implemented under the hood as a Seq.
FocusList :: Focus -> !Seq a -> FocusList afocuslist Data.FocusList No documentation available.
focusList :: FocusList a -> !Seq afocuslist Data.FocusList No documentation available.
focusListFocus :: FocusList a -> !Focusfocuslist Data.FocusList No documentation available.
fromListFL :: Focus -> [a] -> Maybe (FocusList a)focuslist Data.FocusList Safely create a FocusList from a list.
>>> fromListFL (Focus 1) ["cat","dog","goat"] Just (FocusList (Focus 1) ["cat","dog","goat"])
>>> fromListFL NoFocus [] Just (FocusList NoFocus [])
If the Focus is out of range for the list, then Nothing will be returned.>>> fromListFL (Focus (-1)) ["cat","dog","goat"] Nothing
>>> fromListFL (Focus 3) ["cat","dog","goat"] Nothing
>>> fromListFL NoFocus ["cat","dog","goat"] Nothing
complexity: O(n) where n is the length of the input list.-
focuslist Data.FocusList No documentation available.
lensFocusListFocus :: forall a f . Functor f => (Focus -> f Focus) -> FocusList a -> f (FocusList a)focuslist Data.FocusList No documentation available.
unsafeFromListFL :: Focus -> [a] -> FocusList afocuslist Data.FocusList Unsafely create a FocusList. This does not check that the focus actually exists in the list. This is an internal function and should generally not be used. It is only safe to use if you ALREADY know the Focus is within the list. Instead, you should generally use fromListFL. The following is an example of using unsafeFromListFL correctly.
>>> unsafeFromListFL (Focus 1) [0..2] FocusList (Focus 1) [0,1,2]
>>> unsafeFromListFL NoFocus [] FocusList NoFocus []
unsafeFromListFL can also be used uncorrectly. The following is an example of unsafeFromListFL allowing you to create a FocusList that does not pass invariantFL.>>> unsafeFromListFL (Focus 100) [0..2] FocusList (Focus 100) [0,1,2]
If fromListFL returns a Just FocusList, then unsafeFromListFL should return the same FocusList. complexity: O(n) where n is the length of the input list.