Re: JESS: [Q] Using (bind ...) function in JESS

Looks like an error in the book. Thanks for reporting it.


On Feb 15, 2011, at 10:31 AM, GMail (KU) wrote:

> Dear all,
>
> While following the "Jess in action" book to learn JESS, I run into  
> a question.
>
> On page 207 of the book, there is one line of code that I cannot  
> understand fully. The part of the Listing 13.1 has (bind ?s ? 
> question " ") and I don't quite understand why the additional " "  
> was used in this bind method.
>
> I tried to see the effect of the additional " " by experimenting it  
> in the JESS command line, but did not find any meaningful difference.
> For example,
> JESS prompt> (bind ?question "Hello")
> JESS prompt> (bind ?s ?question " ")
> JESS prompt> ?s ;; returns "Hello" without the space
> JESS prompt> (bind ?question "Hello")
> JESS prompt> (bind ?s ?question "123")
> JESS prompt> ?s ;; returns only "Hello" without 123
>
> Can any one explain when I need to use additional " " or any string  
> in the bind method in JESS?
>
> Thanks in advance.
>
> Young-Jin Lee
>

---------------------------------------------------------
Ernest Friedman-Hill
Informatics & Decision Sciences, Sandia National Laboratories
PO Box 969, MS 9012, Livermore, CA 94550
http://www.jessrules.com







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