[Jprogramming] New (?) fold conjunctions: F:. F:: F: F.. F.:

[Henry Rich]

You can do whatever you need without Fold, but it has these features:

* iteration can be forward or backward through items of a noun
* initial value can be provided as its own argument
* early termination is allowed
* either one result for the whole iteration or a result item per iteration
** result of an iteration can be a subset of the complete internal state 
passed to the next iteration
** results of individual iterations can be put into the overall result 
or not
* iteration can be by item or on the entire argument until a condition 
is met

Henry Rich



On 3/28/2020 6:25 PM, Devon McCormick wrote:
> Hi -
> I noticed the "fold" conjunctions only recently.  However, I was under the
> impression that J already has ways to accomplish what is meant by different
> kinds of folds - see
> https://en.wikipedia.org/wiki/Fold_%28higher-order_function%29#In_various_languages
>   .
>
> Can someone involved with the "F" conjunctions explain their rationale?
>
> Thanks,
>
> Devon


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