Re^2: unique elements in an array

Good code. A few optimizations:

use strict;
 
my %guard;
my @unique;
 
while (<>) {
   chomp;
   next if exists $guard{$_};

   push @unique,$_;
   $guard{$_} = undef;
}
print join(" ",@unique),"\n";
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A slight improvement in speed and memory usage, especially when you are dealing with a large number of duplicates.

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