https://github.com/jrincayc/ucblogo-code
Revision ad2aafdb76721bf7ee061407f6a92e005841f163 authored by Joshua Cogliati on 28 June 2022, 01:19:29 UTC, committed by GitHub on 28 June 2022, 01:19:29 UTC
ISSUE-134: Fixed issue with LOADPICT if it's called before other turtle commands
Tip revision: ad2aafdb76721bf7ee061407f6a92e005841f163 authored by Joshua Cogliati on 28 June 2022, 01:19:29 UTC
Merge pull request #135 from dmalec/ISSUE-134
Merge pull request #135 from dmalec/ISSUE-134
Tip revision: ad2aafd
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.)
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