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6min chapter
Fold and Other Functional Conjunctions
The Array Cast
The Importance of Recursion in Programming
The star diarcis notation that's used in APL and the pretty much the current definition of fold. There are several patterns that involve applying a verb on selected portions of an argument. In some cases you can use that to do the thing I was talking about which is repeated application of the items to the state. But there are some problems that the first is that because of the right to left orientation of of J's operator execution it only really works simply if you go right to left, he says.
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