Back in the days of yore I programmed in Clipper (xBase compiler).
The producer (Nantuket, then CA) held annual DevCons in London for European developers and usually ran a "silly" competetion. One year it was to come up with the Most Useless Function.
The winner (I think it was one Rick Spence) came up with ispoweron().
Can you do better? For Perl that is. Or at least is Perly in nature.
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Meditations