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Wolfram Blog: Alice and Bob Play a Game of Cards
posted on August 06, 2020 by Arnoud Buzing

While catching up with my old friends Alice and Bob on Zoom a few days ago, I became intrigued by their recent card game hobby—and how they used the Wolfram Language to settle an argument. To figure out who gets to go first at the start of the game, they take one suit (spades) from [...]

 
andre314
andre314
@J.M.'stechnicaldifficulties yep
 
Ghersic
Ghersic
6:01 PM
Does anyone know how to assign an UpUpValue, so to speak?

For example, I'd like something like the following, but that works:

UpValues[g] = {HoldPattern[f_[h_[g[x]]]] :> HoldPattern[f[x] + h[x] + g[x]]}

Such that when I evaluate:

randoFunc[randoOtherFunc[g[x]]]

I get `randoFunc[x] + randoOtherFunc[x] + g[x]` .
This works using the standard TagSet approach for simple depth = 2, standard UpValues - e.g. with just f[g[x]]... but I'd like to overload the triple-decker case as well relative to (g).
 
Ghersic
Ghersic
6:35 PM
The simplest way - were (h) simply a single function - would be to assign an UpValue to (h), but I need this to work for any two "concentric" heads applied to (g), and TagSet and the other functions (as far as I know) don't allow such things.
 

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