If you want to access the last element of an array, it's fewer keystrokes to do $x[-1], or $x[-2] for second last, etc.
It's also clearer, IMO.
But if you prefer to do $x[(scalar @x) - y], then that's ok.
That's about it ... TIMTOWTDI.

Cheers,
Rob

In reply to Re: What array negative number counting means by syphilis
in thread What array negative number counting means by Anonymous Monk

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