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

[John B. <mr...@gm...>]

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 <mcl...@ho...>wrote:

>  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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