It's totally subjective. Whether warranted or not, camel case reminds me of Microsoft code. Underscores remind me of old school programming. I also think camel case is harder to read. Though camel case does take fewer keystrokes to execute. I'll give you that.

$PM = "Perl Monk's";
$MCF = "Most Clueless Friar Abbot Bishop Pontiff Deacon Curate";
$nysus = $PM . ' ' . $MCF;
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In reply to Re^4: Improve readability of Perl code. Naming reference variables. by nysus
in thread Improve readability of Perl code. Naming reference variables. by hakonhagland

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