[racket] Are there Racket structures similar to Common Lisp's?

I like the idea of having optional keyword arguments available in struct
field construction. In many cases, I find it more declarative upon reading
the code, though input takes longer. I just tend to recall names better
than constructor/argument order. It could help to understand the code if
the struct declaration is located further away from the site of struct
construction as well, especially if there is a different problem in the
source that prevents syntax colouring from succeeding and thus the handy
DrRacket file and module navigation from being available :)

-Patrick

On 17 August 2012 14:52, Danny Yoo <dyoo at hashcollision.org> wrote:

>
>
> On Friday, August 17, 2012, Rouben Rostamian wrote:
>
>> Is there the equivalent of Common Lisp's /structure/ type in
>> Racket?  I looked through Racket's User Guide and Reference
>> manuals but did not see something similar, although it's
>> quite possible that I saw one but did not recognize it.
>>
>>
> Racket's default structure constructors are functions with positional
> arguments.  Racket does support functions with optional keyword arguments,
>
>     http://docs.racket-lang.org/guide/lambda.html#(part._lambda-keywords)
>
> so it should be technically possble to do what Common Lisp does here.
>  Other responses to this thread show some macros to autogenerate a helper
> function that uses keyword arguments.
>
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