And it seems to work fine

This suggests that you want an array of unique numbers. It would be better to use the "uniq" function of List::Util. This function preserves the original order. Note that I print colons (:) to separate array elements. 

use strict;
use warnings;
use List::Util qw(uniq);

my @nums = (17, 10, 20, 33, 30, 40, 10, 33, 40, 15, 16, 17);

my @un_nums = uniq(@nums);

local $" = ":";
print "@un_nums\n";

[download]

OUTPUT: 

17:10:20:33:30:40:15:16

[download]
Bill

In reply to Re: Is it safe to use join on a hash? by BillKSmith
in thread Is it safe to use join on a hash? by pritesh_ugrankar

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