[Jprogramming] J902-beta-m backtrack function in ;:

['Pascal Jasmin' via Programming]

Can this be used to emit empty words?  What are some imagined uses of this code?


http://www.jsoftware.com/pipermail/programming/2017-March/046910.html

suggested  ew when j=_1 should emit empty box/word instead of crashing, seemed simple enough, but I don't understand this addition yet.











On Saturday, November 14, 2020, 05:08:33 p.m. EST, Henry Rich <henryhrich at gmail.com> wrote: 





I have been rewriting interfaces to make the JE reentrant.  This beta 
has changes in I/O to the front end, which has more ramifications than I 
can test for.  I am hoping the beta users will cover the combinations & 
report anything that looks unusual.

This beta has the new backtrack function for (x ;: y).

Henry Rich

On 11/14/2020 5:05 PM, Eric Iverson wrote:
> J902-beta-m available for windows/macos/linux.
>
> If you already run 902-beta, then upgrade is easy:
>    load'pacman'
>    'upgrade'jpkg'jengine'
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm


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