Just my two cents: Returning int or char is far better than returning String. Object creation time is one of our big problems in Java. Right?
SDG jco [EMAIL PROTECTED] wrote: > Well, Jess has its own LISP-like type system, following the one from > CLIPS. Jess has one type that Java doesn't (symbols) and doesn't make > many of the distinctions that Java does. For the most part this > doesn't matter; in a very high-level language, you're generally not > worrying about data types. Having the full range of Java data types in > a pattern-matching language would be a nightmare -- do two values not > match because they're not equal, or because one is an int and one is a > short? > > When Jess calls out to Java functions, though, it has to map the Java > types onto its own types and vice-versa, and that mapping has to be > predictable. In my code snippet below ( i.e., (call "foo" charAt 0) ) > that -is- the java.lang.String.charAt() function, and it -does- return > a char. The question is, given Jess's available types (INTEGER, LONG, > FLOAT, ATOM, STRING, EXTERNAL_ADDRESS) how should Jess represent that > char? What I'm suggesting is that INTEGER is a better match than > STRING, and I'm wondering if anybody has any code that would break if > I made this change. > > I think Bryan Talbot wrote: > > > > Why have it return an int instead of a char like the > > java.lang.String.charAt() method does? Also, with a method name like > > "charAt", I would intuitively expect a char type to be returned. > > > > >From: [EMAIL PROTECTED] > > > > > > > > >Currently, Jess maps Java char values onto Jess Strings; i.e., > > >the result of (call "foo" charAt 0) is "f". I'm starting to > > >think that this is the wrong mapping -- a Jess integer would > > >make more sense (i.e., 102.) Does anybody have an opinion, one > > >way or the other? > > > > > --------------------------------------------------------- > Ernest Friedman-Hill > Distributed Systems Research Phone: (925) 294-2154 > Sandia National Labs FAX: (925) 294-2234 > Org. 8920, MS 9012 [EMAIL PROTECTED] > PO Box 969 http://herzberg.ca.sandia.gov > Livermore, CA 94550 > > -------------------------------------------------------------------- > To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' > in the BODY of a message to [EMAIL PROTECTED], NOT to the list > (use your own address!) List problems? Notify [EMAIL PROTECTED] > -------------------------------------------------------------------- -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] --------------------------------------------------------------------
