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by jberryman
5709 days ago
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LYAH is great. For those who are interested, there is a library, 'syz' (Scrap Your Zippers), which provides a generic zipper for any data type, even mutually-recursive types: http://hackage.haskell.org/packages/archive/syz/0.2.0.0/doc/... Its internals are pretty interesting if you've ever thought about implementing a generic zipper structure. For example it uses Typeable to reify the focus type. I'm finishing up my own generic zipper library which I hope will be simpler and more useful than syz. |
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