@a=(1,2,3);
@a_plus_1 = map { $_ + 1 } @a;

##</code><code>##

perl -d -e 1
Loading DB routines from perl5db.pl version 1.28
Editor support available.

Enter h or `h h' for help, or `man perldebug' for more help.

main::(-e:1):   1
  DB<1> %h=(1,2,3,4)

  DB<2> print $h{1}
2