Negative Array Subscripts

• To get the last element in a list or array, use $array[-1] instead of $array[$#array]
• The former works on both lists and arrays, but the latter does not
• Remember that substr, index, rindex, and splice also accept negative subscripts to count back from the end

      splice(@array, -2);   # pop twice
  

• Remember substr is lvaluable:

      substr($s, -10) =~ s/ /./g;