Should be doable: > (set a-world ufo wings [right 'damaged] [left 'broken])
is the most likely syntax I anticipate. On Oct 20, 2010, at 2:50 PM, <engin...@alum.mit.edu> wrote: > 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-boun...@racket-lang.org [mailto:users-boun...@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@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 >>> >>> _________________________________________________ >>> For list-related administrative tasks: >>> http://lists.racket-lang.org/listinfo/users >> >> _________________________________________________ >> For list-related administrative tasks: >> http://lists.racket-lang.org/listinfo/users > > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
