[racket] Are there any functional structs in Racket

Are you all also considering some way to conveniently update more than one
at a time?  Functional style is still much more cumbersome than mutation
style.

(set (set a-world ufo wings right 'damaged) ufo wings left 'broken)
starts to get cumbersome quickly.

Is something like the below possible?  Is it scalable/manageable?  Maybe it
needs more grouping symbols like a cond clause.

(set a-world ufo wings right 'damaged
                       left  'broken)

-Paul

> -----Original Message-----
> From: users-bounces at racket-lang.org [mailto:users-bounces at racket-lang.org]
> On Behalf Of Matthias Felleisen
> Sent: Wednesday, October 20, 2010 2:30 PM
> To: Tony Garnock-Jones
> Cc: Nikita B. Zuev; users at racket-lang.org
> Subject: Re: [racket] Are there any functional structs in Racket
> 
> 
> 
> I have a prototype that supports syntax like this one:
> 
>  (dot a-world ufo wings left)
> 
> which would select the left field of a wings field in a ufo field of a
> world struct.
> 
> Similarly,
> 
>  (set a-world ufo wings left 'broken)
> 
> would be a functional update.
> 
> I intend to add it into the 2htdp languages.
> 
> 
> 
> 
> 
> On Oct 20, 2010, at 2:21 PM, Tony Garnock-Jones wrote:
> 
> > Stephen Bloch wrote:
> >> person-age-set
> >> set-person-age (without the !)
> >> person-with-age
> >
> > I like this last one, especially if it were possible to use the old
> abbreviation of "/" for "-with-":
> >
> > (person/age p 25)
> >
> > Tony
> >
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