[Oberon] Re (2): Alternatives for cases.

[peter at easthope.ca]

From:	Chris Burrows <chris at cfbsoftware.com>
Date:	Sat, 9 Mar 2019 17:47:52 +1030
> If I was able to succinctly write
> 
> IF ch IN {"A", "E", "I", "O", "U"} THEN ...
> 
> isLetter := ch IN {"A".."Z", "a".."z"};
> 
> etc. etc.
> 
> like I was able to in Modula-2 then I might have less need for these features of CASE.

Hypothetically, introduce a higher layer of abstraction appropriate to 
the objective.  For example, make a J interpreter and write the 
control procedures in J.
https://en.wikipedia.org/wiki/J_(programming_language) 
Set inclusion is used in the tags-removal example.
https://en.wikipedia.org/wiki/APL_(programming_language)#HTML_tags_removal
A detailed tutorial is available via the "explanation" link.

Regards,                          ... Lyall E.

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