Should boolean variable names also end in '?' just like boolean returning predicate functions?

[anoopemacs]

No description provided.

[seancorfield]

I don't think there's much consensus on this. Some people like to use ? to indicate a symbol that is bound to a Boolean, but a lot of people feel it should only be used for predicate functions.

I'm in the latter camp -- we have ! and * (and ?) for functions fairly commonly, meaning "mutates"(not safe in a transaction), "implementation" (often for the non-caching version of some fn or for the implementation fn of a macro) -- but we don't use any similar notations for local bindings. The only fairly common Var-level (non-function) annotation we tend to use is earmuffs *some-dynamic-var* and that's partly because that used to be required.