I am simply concatenating strings together based on numbers in an array (see below). However, i'm struggling to adapt the code to take into consideration a third array (@check) which holds consecutive numbers with increments of 1. 
e.g.

my @numbers = ('1', '2', '2', '3', '3');
my @strings = ('hello', 'green', 'grass', 'rainbow', 'pretty');
my @new_strings;

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So the output is: 
hello
greengrass
rainbowpretty

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Heres the code to do this: 
for ( 0 .. $#numbers ) {
  push @{$h{$numbers[$_]}}, $strings[$_];
}
for ( sort { $a <=> $b } keys %h ) {
  push @new_strings, join('', @{$h{$_}}), ">>\n";
}
                                                                      
+                                      
my $v = join ('', @new_strings);
@new_strings = split (/>>/, $v);                                      
+                                                                     
+                                  
my @final_strings;
                                                                      
+                                                                     
+  
for (my $k=0; $k<@new_strings; $k++)     {
             $new_strings[$k] =~ s/\n+//g;
             $new_strings[$k] =~ s/\s+//g;

              if ($new_strings[$k] =~ /\w+/)   {
                       push @final_strings, "$new_strings[$k]";
              }
}

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## PROBLEM ! ==================== If @check contains a number not present in @numbers, I want 'xxxxxxxx' to be inserted into the output in its place. I hope someone can help! #\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ 
@check = ('1','2','3','4');

# desired output:
#-----------------
hello
greengrass
rainbowpretty
xxxxxxxx       # THE 4TH ELEMENT NOW CONTAINS 'xxxxxxxx' as there isn'
+t a '4' in @numbers

[download]

In reply to arrays and strings by Anonymous Monk

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