pod/perldata.pod

53:    $#days           # the last index of array @days
357:of array @days by evaluating C<$#days>, as in B<csh>.  However, this
360:Assigning to C<$#days> actually changes the length of the array.
364:X<$#> X<array, length>
373:    $#whatever = -1;
382:    scalar(@whatever) == $#whatever + 1;