Re: "Back & Forth" - Local variables

On 11/01/2025 2:50 am, sjack wrote:

dxf <dxforth@gmail.com> wrote:
 

Great.  While I've seen co-routines mentioned, examples were rare so I
tended to ignore it.
>

 
-- A closed paren defined as an immediate co-routine can be used at
-- compile time to divide a word into two parts.
-- At run-time the word's first part executes then performs co-routine
-- and somewhere down the input ')' performs co-routine to return control
-- back to the the word's second part.
--   : foo( first part ) second part ;
-- Example:
 
: foo( ." --> " s0 @ sp! ) begin depth while 5 * . repeat ;  OK
 
foo( 3 2 1 ) --> 5 10 15  OK
 
I use 'hi( foo bar baz )' to highlight the output of a sequence of
Forth words.

We'll see.  I'd like to be able to say 'yes, that's unequivocally
superior to any other solution I might use'.  I had that sense with
... R> DROP ... to discard a nest-sys.  I may not use it every day in
programming but it's present in applications I use nearly every day.