Re: [Haskell-beginners] Does Haskell have a function that creates a list corresponding to the nodes in a tree, from the leaf node to the root node?

On 13 June 2011 00:50, Thomas Davie wrote:

The problem with knot tying exercises is that as soon as you try to update you're in trouble.

Sounds like a job for zippers then.... I think Gerard Huet's original paper is online, which is the clearest explanation (though the code is ML). There are Haskell focused explanations on haskell.org / haskell-wiki.