Re: [PATCH] Extensions for SRFI-171 (Transducers)

[Damien Mattei <damien.mattei@gmail.com>]

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hello,
just trying transducers before using it, i try to understand.
what is wrong with that:
scheme@(guile-user)> (list-transduce (tfilter (λ (x) x))
(tdelete-duplicates) (list 1 2 #f 3 3 4))
ice-9/boot-9.scm:1685:16: In procedure raise-exception:
Wrong number of arguments to #<procedure 10786aa60 at
srfi/srfi-171.scm:338:2 (reducer)>

Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.

Regards,
Damien

On Wed, Dec 21, 2022 at 11:01 AM Linus Björnstam <
linus.bjornstam@veryfast.biz> wrote:

> As the author of both the SRFI and the guile code I am very happy you like
> it. I don't have a computer at the moment, but I looked through the code
> and it looked great.
>
> All additions should have been included in the original SRFI :)
>
> one comment: your code uses define-public, which the rest of SRFI-171 code
> does not.
>
> I am not in any position to sign code off for inclusion in guile proper,
> but if the define-public thing is fixed it very much has my blessing.
>
> Best regards
>   Linus Björnstam
>
> On Wed, 21 Dec 2022, at 01:48, Colin Woodbury wrote:
> > Happy holidays everyone, I hope everything is going well for you.
> >
> > Since discovering SRFI-171 (Transducers) I have fallen in love with it.
> > Transducers let me "talk the way I want to talk" while knowing that I'm
> > being efficient underneath w.r.t. to iteration and allocation. In using
> > Guile's implementation, I noticed a few common idioms missing that are
> > otherwise present in other languages, so I've added them in a series of
> > patches. I've been using these often for a number of weeks without
> > issue, but of course have added unit tests as well.
> >
> > The full details are in the commit messages, but here are the main
> highlights:
> >
> >  * rfold: The fundamental reducer. This allows the user to turn any
> > two-arg function into a valid reducer, so that they don't need to worry
> > about hand-writing reducers via case-lambda.
> >  * rfind: Yields the first item in the transduction that matches some
> > predicate. Nice for locating some specific value from a potentially
> > large data source (e.g. a port).
> >  * twindow: Like tsegment, but yields overlapping slices into the data.
> > Cheers, and have a great holiday.
> >
> > Colin
> >
> > Attachments:
> > * 0001-srfi-171-add-twindow-and-various-reducers.patch
> > * 0002-doc-add-new-SRFI-171-reducers-to-the-manual.patch
> > * 0003-srfi-171-add-unit-tests-for-new-functions.patch
>
>

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