No. But then I wouldn't code unless( not $var ){ in the first place, and I wouldn't transform a legitimate use of unless into if( not ... ).

But I would happily code unless( $var ) { in preference to if( not $var ){.

And if the logic of my code dictates that using a guard statement to quit early is preferable to an extended if statement, then I prefer the OP's:

unless( -d or $_ eq '.' or $_ eq '.. ) { die ... }; which I read as

Unless it's a directory and it's neither '.' nor '..' get the hell outta here.

which I think reads easily, and far better than either

if( not( -d or $_ eq '.' or $_ eq '.. ) ) { die ... }; which I'd have to read as

If( not( it's a directory and it's neither '.' nor '..' ) ) get the hell outer here.

or

if( !-d or ( -d and ( $_ ne '.' or $_ ne '..' ) ) ) { die ... }; and read as

If( it's not a directory or ( it is a directory but it's either '.' or '..' ) ) get the hell outta here.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^6: Is this the most elegant way to code directory lookup? by BrowserUk
in thread Is this the most elegant way to code directory lookup? by texasperl

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