For times when I access the last element of an array, I use @array[-1]; however, when I need to know the value of the last index, such as in a loop above, I have seen people recommend two approaches. Let's use the for snippet from the above -- it could be written in either of: 

for my $y (0..@x-1) { }
# or #
for my $y (0..$#x) { }

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Is there a practical difference?

<-radiant.matrix->
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In reply to (digression) preferred syntax for index of last array element? by radiantmatrix
in thread Initialization of arrays by Anonymous Monk

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