[Haskell] Function to replace given element in list

David Feuer david.feuer at gmail.com
Tue Jul 19 23:44:30 UTC 2016

A zipper is a good way to separate the search from the replacement. But the
problem at hand does not require such a separation! If you don't need that,
a zipper seems like overkill.

On Jul 19, 2016 7:39 PM, "Carl Folke Henschen Edman" <carledman at gmail.com>

On Tue, Jul 19, 2016 at 6:13 PM, David Feuer <david.feuer at gmail.com> wrote:

> Using a zipper will not get you very far here. The best way would
> likely be to replace the list with a balanced search tree.

That depends on the pattern of access and usage.  For some a zippered list
will outperform a self-balancing tree and vice versa.  For others a
zippered tree, or something else, will beat either.  But when seeing the
pattern of changing a single element in the middle of a list, a zippered
list is the first improved data structure that comes to mind.

    Carl Edman
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