in reply to Re: Adding an new element after every 5th element in array
in thread Adding an new element after every 5th element in array

Nevermind, this is completely wrong. :(

I think hdb's example could be simplified a bit plus avoid any old-size remainder problems like this: 

while( @array ) {
  push @newarray, splice @array,0,$nset;
  next if @newarray % ($nset * $every);      # no need for a counter w
+ith % op
  push @newarray, $newelement;               # add the new element
}

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