Hi all,
good points about lexical scoping, but I would append:
use references

@a=@b; # the array will be twice in memory
$a=\@b; # the array is once in memory
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This is specially usefull when passing large arrays (or hashes or scalars) to subroutines.
I hope this helps.
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Dr. Mark Ceulemans
Senior Consultant
IT Masters, Belgium