Dousea

X

Y

X

Y

if (not a)
	a = {true} -- 'then' expected near 'a'
end

print(a][1]) -- ')' expected near ']'

W

Z

X

Y

Z

X

Y

Z

W

if (true) then
	print("it's true!") -- 'end' expected (to close 'if' at line 1) near '<eof>'

X

X

print("a")) -- unexpected symbol near ')'

X

X

print(1.."st") -- malformed number near '1..'

X

X

print("I forgot to close this string) -- unfinished string near '<eof>'

X

Y

local

global

field

X

Z

nil

boolean

number

string

function

userdata

thread

table

X

X

X

Z

a = {}
b = "b"

print(a - 0) -- attempt to perform arithmetic on global 'a' (a table value)
print(4 / b) -- attempt to perform arithmetic on global 'b' (a string value)

X

nil

boolean

number

string

function

userdata

thread

table

a = {}
a[10] = "string"

print(a[10] - 1) -- attempt to perform arithmetic on a string value
print("1" % {}) -- attempt to perform arithmetic on a table value

X

Y

local

global

field

X

Z

nil

boolean

number

string

function

userdata

thread

table

X

X

X

Z

a = {}

print(a .. " is a table") -- attempt to concatenate global 'a' (a table value)
print("a.b = " .. a.b) -- attempt to concatenate field 'b' (a nil value)

X

nil

boolean

number

string

function

userdata

thread

table

a = {}

print("Can I concatenate " .. true .. "?") -- attempt to concatenate a boolean value
print("a[1] = " .. a[1]) -- attempt to concatenate a nil value

#

X

Y

local

global

field

X

Z

nil

boolean

number

string

function

userdata

thread

table

X

X

X

Z

print(#a) -- attempt to get length of global 'a' (a nil value)

X

nil

boolean

number

string

function

userdata

thread

table

a = {}
a[97] = false

print(#nil) -- attempt to get length of a nil value
print(#a[1]) -- attempt to get length of a boolean value

X

Y

local

global

field

X

Z

nil

boolean

number

string

function

userdata

thread

table

X

X

X

Z

a = io.open("test.txt")

print(a[1]) -- attempt to index global 'a' (a userdata value)
print(b.b) -- attempt to index global 'b' (a nil value)

X

nil

boolean

number

string

function

userdata

thread

table

a = {}
a[98] = true

print(a[1].index) -- attempt to index a boolean value
print(("a")[1]) -- attempt to index a string value

a[nil] = true -- table index is nil

X

Y

local

global

field

X

Z

nil

boolean

number

string

function

userdata

thread

table

X

X

X

Z

print(a()) -- attempt to call global 'a' (a nil value)

X

nil

boolean

number

string

function

userdata

thread

table

a = {}
a.ortimh = "user"

a.ortimh() -- attempt to call a string value
io.openfile("file") -- attempt to call a nil value

X

Y

nil

boolean

number

string

function

userdata

thread

table

value

Z

X

Z

X

Y

a = {}
b = setmetatable(a, "__add") -- bad argument #2 to 'setmetatable' (nil or table expected)

W

X

Y

nil

boolean

number

string

function

userdata

thread

table

value

Z

nil

boolean

number

string

function

userdata

thread

table

no value

Z

X

W

X

Y

print(table.concat()) -- bad argument #1 to 'concat' (table expected, got no value)

Flacko has written

Some cs2d functions such as player() return false on error (wrong parameter or invalid player ID)

function joinhook(id)
	msg2(id, "Welcome, " .. player(id - 1, "name") .. "!@C") -- attempt to concatenate a boolean value, if id = 1
end

addhook("join", "joinhook")

function joinhook(id)
	msg2(id, "Welcome, " .. player(id, "name") .. "!@C")
end

addhook("join", "welcomehook") -- attempt to call a nil value

DC

a = 25
b = 10

print('Length of \'a\' variable is: ', #a)
print('Length of \'b\' variable is: ', #b)

a

b

get length of global

#

tostring()

a = 25
b = 10

first = tostring(a)
second = tostring(b)

print('Length of \'a\' variable is: ', #first)
print('Length of \'b\' variable is: ', #second)

tostring()

Cebra

..

tostring()

tostring()

Dousea