note greengaroo <p>BrowserUk is right, don't use a module to do that if you can do it with one line of code! Grep receives <del>an array</del> a LIST and returns <del>an array</del> a LIST. The returned array will be shorter, but the elements will be added in the order in which they are encountered in the other array.</p> <p>Imagine you do this: <code> @array1 = @array2; </code> The elements in @array1 will be in the same order has in @array2, right? </p> <p>Now do this: <code> foreach $element ( @array2 ) { push( @array1, $element ); } </code> The elements in @array1 will still be in the same order has in @array2, don't you think? </p> <p>And if you do this: <code> foreach $element ( @array2 ) { if ( not $seen{$element} ++ ) { push( @array1, $element ); } } </code> Guess what? The elements will still be in the same order and I just explicitly did what grep do in one line. </p> <div class="pmsig"><div class="pmsig-823564"> <div class="pmsig"> <i>There are no stupid questions, but there are a lot of inquisitive idiots.</i><br/> <div class="pmsig-823564"> -- [id://823564] </div></div> </div></div> 997453 997466