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# How to Reverse A Nested List In Haskell?

To reverse a nested list in Haskell, you can use the `map` function along with the `reverse` function to reverse each individual sublist and then reverse the entire list. This can be accomplished by mapping the `reverse` function over the nested list and then applying the `reverse` function to the resulting list. This will reverse the nested list in Haskell.

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## What is the difference between reversing a list and reversing a nested list in Haskell?

Reversing a list in Haskell involves flipping the order of elements within a single list. For example, given the list [1,2,3,4], reversing it would result in [4,3,2,1].

Reversing a nested list in Haskell involves flipping the order of elements within each sub-list, as well as flipping the order of the sub-lists themselves. For example, given the nested list [[1,2], [3,4]], reversing it would result in [[4,3], [2,1]]. In this case, the order of the sub-lists is reversed as well as the order of elements within the sub-lists.

## How to reverse a list of lists in Haskell?

You can reverse a list of lists in Haskell by using the `reverse` function along with the `map` function. Here is an example:

 ```1 2 ``` ```reverseListOfLists :: [[a]] -> [[a]] reverseListOfLists = reverse . map reverse ```

In this code, the `reverse` function is applied to each individual list in the list of lists using the `map` function. Then, the overall list of lists is reversed using the `reverse` function.

You can use this function to reverse a list of lists like this:

 ```1 2 3 ``` ```main = do let myList = [[1,2,3], [4,5,6], [7,8,9]] print \$ reverseListOfLists myList -- Output: [[9,8,7],[6,5,4],[3,2,1]] ```

## What is a nested list in Haskell?

A nested list in Haskell is a list that contains other lists as its elements. This means that the elements of the outer list are themselves lists. Nested lists can have multiple levels of nesting, with inner lists containing other lists as elements. Nested lists are commonly used to represent multi-dimensional data structures, such as matrices or trees, in Haskell.

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