> That is what I thought. Is it proper or idiomatic Clojure to use a "?"
> symbol on non-predicate functions?
I don't think so. The standard library doesn't, at any rate.
Note that predicates don't necessarily have to return literal true or
false: in my opinion at least, it's perfectly reasonable to write
(def my-predicate? #{:foo :bar})
-- it'll behave correctly in if and when, but the return value will
actually be a keyword or nil, not true or false.
> That is somewhat what prompted my question. If a "?" symbol is
> generally, always or primarily reserved for predicates, it just seemed
> strange to use a non-predicate example in the book. Especially when
> the
> example could just as easily used true or false, instead of yes
> or no.
Certainly seems odd to me.
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