(join (args)) and mixed data types?

[axtens]

G'day everyone



Pardon my naivete, but I'm having trouble with (join (args)) in that I'm expecting to get a string out of it, but it fails when items in the args are non-string.



For example

Code Select Expand

(define (tracer)
(begin
(set 'str (join (args)))
(append-file "trace.log" str)
(print str)
)
)

(tracer 1 0.2 "do" " " "not")

Out of that I get the following error message

Code Select Expand

ERR: string expected : 1
called from user defined function tracer

How do I make (tracer) sufficiently generic such that it can handle anything (or almost anything) that it receives in the args list?



Kind regards,

Bruce.

[Kazimir Majorinc]

Try something in the style of



(set 'str (join (map string (args))))