Nil Check

Check that a required value is present.

nil_check.lua

local raw = 
local passed = raw ~= nil and raw ~= ""
local status = "fail"
if passed then
    status = "pass"
end
print("raw=" .. tostring(raw))
print("status=" .. status)

local raw = 
local passed = raw ~= nil and raw ~= ""
local status = "fail"
if passed then
    status = "pass"
end
print("raw=" .. tostring(raw))
print("status=" .. status)

local raw = 
local passed = raw ~= nil and raw ~= ""
local status = "fail"
if passed then
    status = "pass"
end
print("raw=" .. tostring(raw))
print("status=" .. status)

required value Checking both `nil` and an empty string catches two common missing-value cases.