https://github.com/jrincayc/ucblogo-code
Tip revision: 83cc26c4471bbf5be58589e2f43a4caba6b98469 authored by Joshua J. Cogliati on 26 December 2019, 17:49:01 UTC
Adding source code to windows install
Adding source code to windows install
Tip revision: 83cc26c
dmaybeoutput
.MAYBEOUTPUT value (special form)
works like OUTPUT except that the expression that provides the
input value might not, in fact, output a value, in which case
the effect is like STOP. This is intended for use in control
structure definitions, for cases in which you don't know whether
or not some expression produces a value. Example:
to invoke :function [:inputs] 2
.maybeoutput apply :function :inputs
end
? (invoke "print "a "b "c)
a b c
? print (invoke "word "a "b "c)
abc
This is an alternative to RUNRESULT. It's fast and easy to use,
at the cost of being an exception to Logo's evaluation rules.
(Ordinarily, it should be an error if the expression that's
supposed to provide an input to something doesn't have a value.)