I usually prefer to do something like for the `roomba` object in
"http://www.neilvandyke.org/racket-roomba/";.
See how there's a `current-roomba` Racket parameter, which provides a
default value for the `#:roomba` optional argument for each procedure.
So, users of the code can pass around the `roomba` object explicitly, or
they can be more terse/lazy, and let the parameter be used.
There's also a `with-roomba` syntax form, as a convenience.
`with-roomba` does the `open-roomba`, `close-roomba`, and `(parameterize
((current-roomba ...)) ...)`.
(If you're micro-optimizing, you might decide you don't want to be
passing around the `roomba` object as an argument all the time, nor
doing parameter referencing. But most code has many bigger things to
optimize before that.)
Neil V.
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