Calling lua function which name is stored in string

Hello,

Is it possible (in plain LUA) to call a (LUA) function which name is stored
in string (like reflection)? 

What I want to do is something like:

function foo( object )
   func = string.format("script_%s", object:getValue() )
   -- somehow call function which name is stored in variable 'func'  (e.g.
script_shoot )
end

Of course this is easy to do so that I generate the string in c++ and call
LUA function from there but I really would like to do this whole thing in
LUA if it is possible.

Thank you.

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