++GrandFather.
Also, if %ss is not used later in the program, then it was probably just used as a 'seen' hash, to keep track of the values seen during the removal of duplicate elements from the array. In the past, the common perl idiom for this has been my %seen; @foo = grep {!$seen{$_}++} @bar;, which looks just like the OP's code. This form 'leaks' the %seen hash, and is *very* confusing to many programmers. To improve clarity and stop the leak, it can be wrapped in a subroutine. The sub is often named 'uniq', the same name as the similar Unix program:

# Remove duplicate elements, leaving only unique elements.
sub uniq {
    my %seen;
    return grep { ! $seen{$_}++ } @_;
}
@foo = uniq @bar;

[download]
Currently, the best practice it to import uniq() from List::MoreUtils, rather than coding it directly:
use List::MoreUtils qw( uniq );
@foo = uniq @bar;

[download]

In reply to Re^2: meaning for the code by Util
in thread meaning for the code by sanku

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