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Fold and Scan
The Array Cast
How to Do a Scan That Matches APL in J
I was hoping to be able to do with the J fold though so like the capital F and then insert daughter colon or whatever sequence you need. That's how I saw that in BQN and in other languages. So just with that without a reduction at the end without without without like without two separate without a scan and a reduction just just with the fold. And it seemed like there was a possibility that the fold in J could do it all at once because it had sort of two arguments. Yeah, you always have to do a reduction. Well so that's what I was. The folding direction is right to left. And also your your outer suffix is direction isright to left.
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