~a

There are other formats too: ~s, ~v, etc.

You can think of these as shortcuts for (lambda (x) (format "~a" x)), (lambda (x) (format "~s" x)), … (though actually they are more expressive than that)

You can use format which is the same as printf but returns a string instead.

You shouldn’t lose anything if you upgrade racket, but in doubt you should as always backup your programs on a usb key or in the cloud.

Even you drracket prefs and quickscripts will be kept (unless you manually erase the tacket prefs directory)

i think what i really want is a way to automatically install upgrade all packages when i switch to that version

That’s raco pkg migrate

i had no idea about that command

sooo… i install first the new version then i use raco pkg migrate?