Daftar Isi

• unshift ARRAY,LIST

• unshift EXPR,LIST

  Does the opposite of a shift. Or the opposite of a push,depending on how you look at it. Prepends list to the front of thearray and returns the new number of elements in the array.

   unshift(@ARGV, '-e') unless $ARGV[0] =~ /^-/;
   

  Note the LIST is prepended whole, not one element at a time, so theprepended elements stay in the same order. Use reverse to do thereverse.

  Starting with Perl 5.14, unshift can take a scalar EXPR, which must holda reference to an unblessed array. The argument will be dereferencedautomatically. This aspect of unshift is considered highlyexperimental. The exact behaviour may change in a future version of Perl.

  To avoid confusing would-be users of your code who are running earlierversions of Perl with mysterious syntax errors, put this sort of thing atthe top of your file to signal that your code will work only on Perls ofa recent vintage:

   use 5.014;# so push/pop/etc work on scalars (experimental)