When going through an array, a for() loop will keep track the index of the element it's at, so it knows what the next element will be. 
for (@array) { ... }
# is kind of like
for ($i = 0; $_ = $array[$i], $i < @array; $i++) { ... }

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In reply to Re: Question on arrays by japhy
in thread Question on arrays by Anonymous Monk

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