Thanks to both Sunanda and Tom: actually I found the following either (do b)[...][...] worked, but your inputs will help keep me out of trouble: especially Sunanda's observations... cheers! tim
* [EMAIL PROTECTED] <[EMAIL PROTECTED]> [031013 12:51]: > > Tim: > > What do I need to do so that my answer will be: > > b evaluates to 'false' > > If a is still has a value, when you come to check the condition, then all you > need is a do after the either: > > a: 1 > b: [a = 0] > either do b [print "b evaluates to 'true'"][print "b evaluates to 'false'"] > b evaluates to 'false' > > > If a no longer has a value -- maybe it's been unset or is in another context > -- then the above code won't work.... > > a: 1 > b: [a = 0] > unset 'a > either do b [print "b evaluates to 'true'"][print "b evaluates to 'false'"] > ** Script Error: a has no value > > ....In which case, you'll have wanted to evaluate the result and save it in b > at the earlier opportunity: > > a: 1 > b: a = 0 > unset 'a > either b [print "b evaluates to 'true'"][print "b evaluates to 'false'"] > b evaluates to 'false' > > > You could of course use this last possibility even if a still has a value -- > but it'll set b to the logical value at the time of the test, not the current > value of a: > > a: 1 > b: a = 0 > a: 0 > either do b [print "b evaluates to 'true'"][print "b evaluates to 'false'"] > b evaluates to 'false' ;; even though a = 0 right now > > > Sunanda. > -- > To unsubscribe from this list, just send an email to > [EMAIL PROTECTED] with unsubscribe as the subject. -- Tim Johnson <[EMAIL PROTECTED]> http://www.alaska-internet-solutions.com http://www.johnsons-web.com -- To unsubscribe from this list, just send an email to [EMAIL PROTECTED] with unsubscribe as the subject.