The usefulness of the F. F: family (there will probably be just 1 or 2 vocabulary entries) is that they replace / and /\ when the result of u/ item_of_y (with optional initial value) is a different shape than item_of_y. Most often it is the shape of the initial value, though with F. that initial value can change to any shape as the items of y are applied to it.
Z: allows breaking out of such a fold when a condition is reached (usually a success condition for finding what you were looking for) Z: might also be usable when wishing to exit/abort an arbitrary verb, for example, finding the first value that meets threshold (1 i.~ 20 < ])@:+: i.10000000 could become, something like >:@# Z:^:(20 <])@:+: though this needs work, and probably Z: needs to be an adverb that has its abort condition as u, which might lose flexibility for its main purpose with F. ________________________________ From: Brian Schott <schott.br...@gmail.com> To: Programming forum <programm...@jsoftware.com> Sent: Friday, March 2, 2018 1:02 PM Subject: Re: [Jprogramming] Insert initialising Have you considered using Z and z instead of Z and F? And maybe using z and Z for the parallels to .: and :. although .: and :. might be more suggestive of the distinctions that they make. I frankly have a very hard time grokking all the different folds, not having used any at all. But I am sort of not looking forward to the revised Vocabulary page with the several F's added. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
