On Sun, 2 Jul 2017, Jean-Christophe Helary wrote:

> What's the difference between:
>
> (let ((name "JC"))
>  (prin1 "My name ")
>  (princ " is ")
>  (princ name)
>  (princ ".\n\n"))
>
> and
>
> (message "My name is %s.\n\n" "JC")
>
> ?
>
> Unless we have a non default value for standard-output both send the value to the echo area, right ?
>
> Besides for the possibility prin1 and princ have of printing to standard-output and not specifically to the echo area, what is the actual difference between the two and message ?

* Documentation about prin? family:
(info "(elisp) Output Functions")

* "The recommended way to show a message in the echo area is with the
   `message' function, not `princ¢".
   Extracted from:
(info "(elisp) Programming Tips")

* `message' and the echo area:
(info "(elisp) The Echo Area")