Perl 5 version 20.3 documentation
- pop EXPR
Pops and returns the last value of the array, shortening the array by one element.
Returns the undefined value if the array is empty, although this may also happen at other times. If ARRAY is omitted, pops the
@ARGVarray in the main program, but the
@_array in subroutines, just like
Starting with Perl 5.14,
popcan take a scalar EXPR, which must hold a reference to an unblessed array. The argument will be dereferenced automatically. This aspect of
popis considered highly experimental. The exact behaviour may change in a future version of Perl.
To avoid confusing would-be users of your code who are running earlier versions of Perl with mysterious syntax errors, put this sort of thing at the top of your file to signal that your code will work only on Perls of a recent vintage:
- use 5.014; # so push/pop/etc work on scalars (experimental)