[Factor-talk] Using combinators as a substitute for loops

[Michael Clagett]

Hi ---
 
Finally getting around to developing my first serious Factor code and I have a 
quick question.  I'm a Forth programmer (although of late it has been mostly my 
own bastardized version of Forth).  I'm thinking of one immediate use of 
Combinators as a way of eliminating some of the unsightly procedural code that 
lives in the kind of Forth function I would write inside of, say, a Begin While 
Repeat loop. 
 
But if what I would have wanted to do with my loop is loop through every item 
in a collection of some sort until some condition was true and at that point 
exit the loop early, is there a way to do this using Combinators?  Are there 
versions of the primary ones that will operate on the target sequence only 
until a condition is reached?  I will of course peruse the documentation, but I 
thought I would just ask in case someone could steer me there more quickly (and 
in case some other newbie has the same question).
 
Thanks much.
 
Mike
 
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Re: [Factor-talk] Using combinators as a substitute for loops

[John Benediktsson]

Hi Michael,

You might also be interested in some of the words in sequences which
handle this particular use-case.  For example, see find, find-from, and
find-last.

( scratchpad ) { bread eggs milk } [ eggs = ] find

--- Data stack:
1
eggs


If you're curious how it is implemented, you can type: \ find see and then
click on different parts of the word definition to see its implementation.

Best,
John.

On Sun, Oct 9, 2011 at 6:06 AM, Michael Clagett mclag...@hotmail.comwrote:

  Hi ---

 Finally getting around to developing my first serious Factor code and I
 have a quick question.  I'm a Forth programmer (although of late it has been
 mostly my own bastardized version of Forth).  I'm thinking of one immediate
 use of Combinators as a way of eliminating some of the unsightly procedural
 code that lives in the kind of Forth function I would write inside of, say,
 a Begin While Repeat loop.

 But if what I would have wanted to do with my loop is loop through every
 item in a collection of some sort until some condition was true and at that
 point exit the loop early, is there a way to do this using Combinators?  Are
 there versions of the primary ones that will operate on the target sequence
 only until a condition is reached?  I will of course peruse the
 documentation, but I thought I would just ask in case someone could steer me
 there more quickly (and in case some other newbie has the same question).

 Thanks much.

 Mike




 --
 All of the data generated in your IT infrastructure is seriously valuable.
 Why? It contains a definitive record of application performance, security
 threats, fraudulent activity, and more. Splunk takes this data and makes
 sense of it. IT sense. And common sense.
 http://p.sf.net/sfu/splunk-d2dcopy2
 ___
 Factor-talk mailing list
 Factor-talk@lists.sourceforge.net
 https://lists.sourceforge.net/lists/listinfo/factor-talk


--
All of the data generated in your IT infrastructure is seriously valuable.
Why? It contains a definitive record of application performance, security
threats, fraudulent activity, and more. Splunk takes this data and makes
sense of it. IT sense. And common sense.
http://p.sf.net/sfu/splunk-d2dcopy2___
Factor-talk mailing list
Factor-talk@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/factor-talk