These functions can be used in REP patterns directly without namespace. The first argument of these functions is always
rep, the reference to the REP chatbot itself. It should be omitted when calling the functions in REP patterns. For example,
(user-first-name) is the right way to call the function
(juji.func.user/user-first-name rep) as in
[my pattern (user-first-name)].
However, when using such function outside of REP patterns (e.g., in a self defined function in REP script), it should be called with appropriate namespace and all of its arguments, e.g.,