Fold and Scan
The Array Cast
The Advantages of Prefixing the Identity Elements in Binary Operations
There's a version of a scan that prefixes the identity element. The result, how does that work for like any custom binary operation? Well, you'd have to pass in an initial element. So K and Q and BQN all have this initial element. And there's this other thing that I mentioned, I guess there's two podcasts to go about how I think the kind of natural way to split it up is to have the result from the fold.
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