3.6.7 Naming conventions

By convention, the names of procedures that store values into previously allocated locations usually end in !.

By convention, -> appears within the names of procedures that take an object of one type and return an analogous object of another type. For example, list->vector takes a list and returns a vector whose elements are the same as those of the list.

By convention, the names of predicates (procedures that always return a boolean value) end in ? when the name contains any letters; otherwise, the predicate’s name does not end with a question mark.

By convention, the components of compound names are separated by -. In particular, prefixes that are actual words or can be pronounced as though they were actual words are followed by a hyphen, except when the first character following the hyphen would be something other than a letter, in which case the hyphen is omitted. Short, unpronounceable prefixes (fx and fl) are not followed by a hyphen.

By convention, the names of condition types start with &.