On 5/27/2020 6:34 AM, Jens Axel Søgaard wrote:
In standard Racket an application doesn't communicate how many values
a function is expected to produce.
You can ask: see procedure-result-arity
https://docs.racket-lang.org/reference/procedures.html
I have written a small proof-of-concept of an assignment operator :=
that communicates to a function how many extra values it is expected
to produce (and still works with standard functions).
Are there alternative solutions that are better than the "use a
keyword" approach?
You can use call-with-values which connects the function that produces
with the one that consumes, but they have to agree on the number of
values being passed or it won't work.
You can use a Rest argument in the consumer if the values from the
producer are put into a list.
Unfortunately, Scheme did not embrace the idea of using tuples for
return values, nor did it allow to catch only the first N values as was
permitted by Lisp.
George
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