I've noticed that beginning student language does not allow definition of a function which takes no arguments. For instance:
(define (foo) 3)
=>
define: expected at least one argument name after the function name, but
found none in: (foo)
It's not obvious to me why this is the case. I can sort of guess at the
reasoning, and it makes some sense -- such a function is obviously not a
pure function, or
(define (foo) r)
(... (foo) ...)
could be adequately replaced by
(define foo 3)
(... foo ...)
but I'm teaching a sixth grader who's coming to Racket from LOGO (and
starting HtDP), and she would like to reproduce some of the things she's
done with turtle graphics using Racket and graphics/turtles. It would
be nice to be able to, eg, translate
to circle
right 1
forward 1
circle
end
into
(define (circle)
(turn 1)
(draw 1)
(circle))
without giving up on the other safety precautions provided by BSL.
Thoughts? Is there a way to turn this check off without moving up to
another racket language?
--
Jim Wise
[email protected]
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