Question

How to use assert error handling 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
 
print(mul(8))

 
 
--[[
run:
    
lua: lua:3: b is not a number
   
--]]

 

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Answer 2

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
 
print(mul(8, 3))
 
 
 
 
--[[
run:
    
24
   
--]]

 

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