Editing SuperBASIC (section)

== Advanced features ==

* RESPR for resident [[Function (computer programming)|procedures]], e.g. to extend QDOS
* choice of parameters passed to procedures
* procedures return parameters as chosen
* <code>IF</code> - <code>THEN</code> - <code>ELSE</code> - <code>END IF</code>
* <code>FOR</code> - <code>NEXT</code> - <code>EXIT</code> - <code>END FOR</code>
* <code>REPeat</code> - <code>NEXT</code> - <code>EXIT</code> - <code>END REPeat</code>
* <code>SELect ON</code> - <code>ON</code> - <code>REMAINDER</code> - <code>END SELect</code>
* arbitrarily <code>RETurn</code> from within procedures & functions
* [[Type conversion|data type coercion]] between [[Variable (computer science)|numeric]] and [[String (computer science)|string variables]]
* actual parameters passing data type to formal parameters
* [[Array (data structure)|array]] operations: slicing, joining etc.
* <code>LOCal</code> arrays & (string) variables
* <code>AUTOmatic</code> line numbering
* relative <code>RESTORE</code> & <code>DATA</code>

The function below illustrates the last eight of these features. After having <code>RUN</code> it, entering

       PRINT weekdays$(Iso("19631122",1))

will print <samp>FRI</samp> to the screen. Until cleared (e.g. by entering <kbd><code>NEW</code></kbd>), the function {{mono|Iso}}<ref>gopher://sdf.org/0/users/retroburrowers/TemporalRetrology/QL/JG</ref> will act like an extension to the operating system. Similarly, according to the QL User Guide, "many of the operating system commands are themselves defined as procedures."<ref>{{Cite book |last=Berry |first=Stephen |url=http://www.dilwyn.me.uk/docs/ebooks/olqlug/QL%20Manual%20-%20Keywords.htm#datareadrestore |archive-url=https://web.archive.org/web/20170222113142/http://www.dilwyn.me.uk/docs/ebooks/olqlug/QL%20Manual%20-%20Keywords.htm#datareadrestore |url-status=usurped |archive-date=February 22, 2017 |title=QL User Guide |publisher=Sinclair Research Ltd |year=1984 |edition=2nd |location=Cambridge}}</ref>