OpenComputerScripts/libs/checkarg.lua

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local function do_check(x, expected_type)
if (type(x) ~= expected_type) then
error(expected_type .. " expected, got " .. type(x))
end
end
function checknumber(n)
do_check(n, "number")
end
function checkstring(n)
do_check(n, "string")
end
function checknil(n)
do_check(n, "nil")
end
function checkbool(n)
do_check(n, "boolean")
end
function checkuserdata(n)
do_check(n, "userdata")
end
function checkfunc(n)
do_check(n, "function")
end
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function checkfunction(n)
do_check(n, "function")
end
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function checktable(n)
do_check(n, "table")
end