#!/usr/bin/perl
use strict;
use warnings;
 
my @hello = ("Hello", "World", "BANG!");

sub ListInsert
{
	my ($lsList_ref, $sItem, $nItem) = @_;
    my @lsList = @$lsList_ref;
	
	splice(@lsList, $nItem, 0, $sItem);
	
	print "@lsList\n";
}
ListInsert(\@hello, "!", 2);