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Re: A practical use of Logic::Kleene (3-valued logic)

by BrowserUk (Pope)
on Sep 14, 2011 at 14:44 UTC ( #925922=note: print w/replies, xml ) Need Help??

in reply to A practical use of Logic::Kleene (3-valued logic)

"Three value logic" is of little use when you only have binary control mechanisms.

To be of value, you'd have to have a control structures that had three branches:

if( <condition> ) { ... } else { ... } otherwise { } my $var = <COND> ? $a :: $b :: $c;

Given that about 90% of programmers seem unable to handle the idea of:

unless( <cond> ) { ... } else { ... }

It seems unlikely that they'd go for trinary control mechanisms any time soon.

Without them, you'd just end up coding the direct equivalent of:

if( $loginAttempted ) { if( $loginSuccessful ) { ... } else { ... } } else { ... }

But in a far more obscure way.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

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