perlquestion eff_i_g Pearls of Perl, <br><br> When collecting data that you only want unique values from, would you: <br><br> 1. Use a hash; the keys being what you're interested in and the values being arbitrary; <br><br> 2. Use an array; filtering it through a routine that makes it unique; or <br><br> 3. ? <br><br> What is "best practice"? <br><br> Thank you :)