In response to your second question, you don't need to eval. Use what's called a "symbolic reference" and do this:
# v Assign a variable name to the $result variable
my $result = "${input}_def";
return $$result if (defined ($$result));
# ^dereferencing
return $input
Check out
perlref for more info.
BUT (big but...) you should be using "real" or "hard" references. Because in general, Symbolic refernces are just a bit too much power for us mortals to handle, because you can muck stuff up so easily. Check out perlref again, but this time look for hard references info. The truth is, you could do all of this with a hash and references. Good luck!
Who is Kayser Söze?
Code is (almost) always untested.
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