=over =item pop ARRAY =item pop Pops and returns the last value of the array, shortening the array by one element. Has an effect similar to $ARRAY[$#ARRAY--] If there are no elements in the array, returns the undefined value (although this may happen at other times as well). If ARRAY is omitted, pops the C<@ARGV> array in the main program, and the C<@_> array in subroutines, just like C. =back