When you specify $_ as an argument for reverse in list context, it is taken as the single member of the list to reverse. Equivalently, no arguments represent an empty list.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: New user, confusion over print and lists by choroba
in thread New user, confusion over print and lists by jktstance

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