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2min chapter
Fold and Other Functional Conjunctions
The Array Cast
The Problem With Scanning
In scan the final result is the entire accumulated state after each move so what I'm going to have at the end it may be that I I decide that what my result is going to be. My intermediate state will be the board whose move it is and then what I really want which is how many pieces there are. It might turn out to be a problem to keep a copy of that intermediate state for each iteration of the argument particularly if you don't care about it at the very end of the day.
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