I couldn’t agree more. One of my pet abominations is code like this:
if ($i != $j)
# not equal
# not not equal -- huh?
which can so easily be recast as:
if ($i == $j)
# not equal
So, let’s propose a general style guideline:
Thou shalt not code in double negatives.
For an amusing commentary on this theme, see Re^2: Can't remove directory-Permission denied (knot).
And for the one legitimate exception to the rule (that I can think of offhand), see Secret Perl Operators: the boolean list squash operator, x!!.
Athanasius <°(((>< contra mundum
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