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

Absolutely! 

On Aug 17, 2012, at 4:02 PM, Patrick Mahoney wrote:

> 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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