//Example A:
//The variable MY_GLOBAL gets referenced 30 times per update.
for i = 1,15,1 do
   MY_GLOBAL = i + MY_GLOBAL;
end

//Example B:
local my_local = MY_GLOBAL;
for i = 1,15,1 do
   my_local = i + my_local;
end
MY_GLOBAL = my_local

0.5*x

x/2

for i,v in pairs(My_Table) do end

function Update(self)
   local class = self.ClassName;

   if class == "AHuman" then --check 1
      print(1);  --block 1
   elseif class == "ACrab" then --check 2
      print(2);  --block 2
   elseif class == "HDFirearm" then --check 3
      print(3);  --block 3
   elseif class == "TDExplosive" then --check 4
      print(4); --block 4
   end
end

function Create(self)
   self.switch = {   
      ["AHuman"] = function () return 1 end, --block 1
      ["ACrab"] = function () return 2 end, --block 2
      ["HDFirearm"] = function () return 3 end, --block 3
      ["TDExplosive"] = function () return 4 end --block 4
   };
end

function Update(self)
    local blockOfCode = self.switch[self.ClassName]; --returns a function.
         print( blockOfCode() ); --blockOfCode is a function, so we use () to execute it.
end