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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