They know if there is a predefined function in the haskell that gives an element, it replaces it with another element of a certain position in the list. For example:
func 1 2 [1,2,3,4]
[1,2,1,4]
Haskell- Replace function in a list
1
asked by anonymous 23.10.2017 / 09:26
1 answer
0
If you need to change elements in a given index, lists are not the framework for this. You could use Seq of Data.Sequence , in which case the function you are looking for is update :: Int -> a -> Seq a -> Seq a .
To do what you wanted in your example using the update would look like this:
> import Data.Sequence
> update 2 1 $ fromList [1,2,3,4]
fromList [1,2,1,4]
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24.10.2017 / 05:11