Reading the Zen of Jess on the Wiki, I spoted that one :
"Anger - Calling functions on LHS of a rule
Anger is what Dr. Friedman-Hill will choke back when you put (> 3.1415 x) on
left-hand side (LHS) of a rule and then you ask," What went wrong?" Once you
start coding, understand that with very few exceptions, the LHS of a rule is
reserved for patterns only. Function calls are (typically) the actions that
happen when patterns are matched. They go on the right-hand side (RHS) of
rules only. "
I currently use function in my Jess rules (for classification purpose) and I
really don't see why it's a problem ? For example, I use evenp/oddp to
classify some facts according to one of their slots.
Thanks,
JFL
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