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Henry Rich’s Deep Dive into J

The Array Cast

00:00

Using J to Boost Performance on an Out-of-Order CPU

Fold allows splits the part that passes state into a part that does not become the next iteration. fold isn't being copied every single time, which is my guess is why it's so much more efficient than simple reduce. The code was coded to a computing model that's basically a Motorola 68000. And fetch instruction, fetch, operand execute.

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