Question

How to use check whether function argument is a number in Lua

Answer 1

local function mul(a, b)
   assert(type(a) == "number", "a is not a number")
   assert(type(b) == "number", "b is not a number")
   return a * b
end

mul("we", 9)




--[[
run:
   
lua: lua:2: a is not a number
  
--]]

 

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