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Re: Extracting Unique Characters from a Array

by mreece (Friar)
on Sep 07, 2006 at 17:41 UTC ( #571757=note: print w/ replies, xml ) Need Help??

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  1. or download this
    my @nums = qw(2 1 3 5 4 5 4 3 2 1);     # order is not important
    
    ...
        }
    }
    ## TODO: do something with @unique
    
  2. or download this
    my @nums = qw(2 1 3 5 4 5 4 3 2 1);    # order is not important
    my %seen = map { $_ => 1 } @nums; # build a hash; keys will be unique!
    @nums = sort keys %seen;       # replace old list with new sorted list
    ## TODO: do something with @nums
    
  3. or download this
    my @nums = qw(2 1 3 5 4 5 4 3 2 1);
    
    ...
        $previous = $current;     # 'current' becomes 'previous'
    }
    ## TODO: do something with @unique
    

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