The Perl equivalent for this is C<$#myarray>.

Set the highest index in the array to the given number, equivalent to
Perl's C<$#array = $fill;>.

RJ
##</code><code>##


trigger for I<container magics>, i.e. it will for C<%ENV> or C<%SIG>
but not for C<$#array>.

perl-5.22.0/pod/perldata.pod

    $days{'Feb'}	# the 'Feb' value from hash %days
    $#days		# the last index of array @days

The length of an array is a scalar value.  You may find the length
of array @days by evaluating C<$#days>, as in B<csh>.  However, this
isn't the length of the array; it's the subscript of the last elemen

which is a different value since there is ordinarily a 0th element.
Assigning to C<$#days> actually changes the length of the array.
Shortening an array this way destroys intervening values


##</code><code>##

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;