2016-03-16 22:18 GMT+01:00 Greg Trzeciak <gtrzec...@gmail.com>:
>
> Thanks Dan, seems to be exactly what I need (especially the combination
> with ractive.js! BTW you couldn't find js framework with name more fitting
> to work with racket ;)
> I am only curious what racket subset does urlang include or rather what
> won't work in urlang.
Hi Greg,
Think of Urlang as JavaScript with s-expression syntax.
The core urlang language includes constructs that mirror JavaScript almost
one-to-one.
So Urlang is not "Racket to JavaScript compiler".
There are few miniscule differences:
- functions support optional arguments
- The = operator generates === in JavaScript
- if will only count the false value as false (zero is not considered
to be true)
That said: Urlang does support macros, which means you can write
constructs that expand into core Urlang.
In urlang/for you will find a Racket-ish for constructs.
That is for, for*, for/sum, for*/sum etc
https://github.com/soegaard/urlang/blob/master/urlang/for.rkt
In urlang/extra you will find some often used macros:
These constructs can be used as expressions:
; (begin0 expr statement ...)
; (when test statement ... expr)
; (unless test statement ... expr)
; (cond [test statement ... expr] ...)
; (case val-expr clause ...)
; where clause is [(datum ...) statement ... expr]
; or [else statement ... expr]
; (letrec ([id val-expr] ...) statement ... expr)
; (let* ([id val-expr] ...) statement ... expr)
;; These constructs can be used as statements:
; (swhen test statement ...)
; (sunless test statement ...)
; (scond [test statement ...] ...)
https://github.com/soegaard/urlang/blob/master/urlang/extra.rkt
We are working on making some more examples.
/Jens Axel
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