Lua: attempt to perform arithmetic on a string value

Question

I\'m trying to add a string to a returned value in lua:

local function func(str)
   return (str+\"_something\")
end

print(func(\"ABC\"))

a

Answer 1

see "Concatenation" in this link: http://lua-users.org/wiki/StringsTutorial

The solution is to use the .., as in example:

local function func(str)
   return (str.." WORLD")
end

print(func("HELLO"))

that's should return:

HELLO WORLD