Removes and returns the last element of the array, shortening the array by one element.
my @arr = ('cat', 'dog', 'mouse');
my $item = pop(@arr); # 'mouse'
# @arr is now ('cat', 'dog')Returns undef if the array is empty.
Note: pop may also return undef if the last element in the array is undef.
my @arr = ('one', 'two', undef);
my $item = pop(@arr); # undefIf ARRAY is omitted, pop operates on the @ARGV array in the main program, but the @_ array in subroutines. pop will operate on the @ARGV array in eval STRING, BEGIN {}, INIT {}, CHECK {} blocks.
Starting with Perl 5.14, an experimental feature allowed pop to take a scalar expression. This experiment has been deemed unsuccessful, and was removed as of Perl 5.24.
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