Fantasy Basic: Return values from subroutines?

[skx]

Looking at the code of my toupper/tolower example it is clear that BASIC makes it too easy to use globals:

 10 LET a$ = "STEVE"
  20 GOSUB blah
  30 REM a$ is now updated

If we wanted to provide clarity we could have said:

  10 LET a = "STEVE"  
  20 LET a = GOSUB 300
 30 END
 300 RETURN 3

i.e. "RETURN" now returns an expression. It doesn't help a lot, because the "input parameter" is still a random global. To allow named-parameters we'd need to implement "DEF FN" + "FN". But it's a cheap hack that might be useful.

Filed as fantasy issue for now.

[skx]

I'll close this because DEF FN and FN are implemented, which allows the same result.