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Lenses in Guile?

From: Zelphir Kaltstahl
Subject: Lenses in Guile?
Date: Tue, 18 Feb 2020 14:44:16 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1


This reminds me of something: Is there something like for Guile? Or perhaps an
easy to understand tutorial on implementing it?


On 2/18/20 2:38 PM, Christopher Lam wrote:
> A bit late, and perhaps not as sophisticated as some bigger modules here.
> Two functions defined as follows: nested-alist-set! nested-alist-get at
> Consider a nested alist describing unix file system
> (define lst
>  (list
>   (cons 'usr (list
>               (cons 'bin "binary files")
>               (cons 'games "g4m3s")
>               (cons 'include (list
>                               (cons 'guile (list
>                                             (cons '2.2 "old")))
>                               (cons 'linux "da best")))))))
> We can access a leaf node via (nested-alist-get lst '(usr include linux))
> --> "da best", and set a leaf node via (nested-alist-set! lst '(usr include
> python) "boo"). This is probably easy to seasoned schemers, but still a
> nice pair of functions to use in modifying nested alists before conversion
> into json.
> On Mon, 17 Feb 2020 at 09:16, Ludovic Courtès <address@hidden> wrote:
>> Hi!
>> Ricardo Wurmus <address@hidden> skribis:
>>> What do you think about adding these things to
>>> ?  This was once intended to
>>> be a collection of useful tools that come in handy when writing web
>>> applications.
>> I didn’t know about guile-webutils but consolidating Web tools in this
>> package sounds like a great idea!
>> Ludo’.

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