List::SomeUtils provides some trivial but commonly needed functionality on lists
which is not going to go into List::Util.

All of the below functions are implementable in only a couple of lines of Perl
code. Using the functions from this module however should give slightly better
performance as everything is implemented in C. The pure-Perl implementation of
these functions only serves as a fallback in case the C portions of this module
couldn't be compiled on this machine.

WWW: http://search.cpan.org/dist/List-SomeUtils/