map returns a new list, whereas for allows modification of an existing one
It sounds like contracdicting although, perhaps, you didn't mean it. The map operator allows modification as well since $_ would be a reference to the corresponding elements of existing array. 
$ perl -wle 'my @ar = qw(one two three); print "@ar"; my @new = map { 
+$_ = uc } @ar; print "@new"; print "@ar"'
one two three
ONE TWO THREE
ONE TWO THREE

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In reply to Re^2: Perl For loops by naikonta
in thread Perl For loops by d2caetano

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