Variable in variable's name?

[Kev Lugli <kevlugli@...>]

Hi, maybe it's a silly question, but I'd like to know how to declare
for example a function using a variable in its name. For example:

base = 'f'
base..'inal' = 'result'
^
^
Where "base" is a variable and "inal" a simple string.
The resulting variable name sould be "final".
Thanks in advance.