This means that expressions like q? A: b = c and (q? A: b) = c are both legal and are parsed differently, the former being equivalent to q? In C there are conditional assignment situations where use of the if-else statement is impossible, since this language explicitly distinguishes between initialization and assignment. Lua: test2.lua:2: attempt to perform arithmetic on local 'b' (a nil value) stack traceback: test2.lua:2: in function 'add' test2.lua:5: in main chunk C:? This is a runtime error, which had occurred due to not passing two variables.

Assignment lets you 'assign' (set) a variable to a value.
eg.
You can do multiple assignments, eg.
That does the same thing as the first example.
Multiple assignments are not generally used on their own (they can be confusing to read), except in collecting the results from a function. Functions can return multiple results, so multiple assignment is a useful way of getting those results. eg.
In this example, a will get the start character position of the match, b will get the end position, and c will get the capture.

With multiple assignment, if you (or the function) provides too few values, the extra ones are set to nil, eg.
This sets a to 0, b to 1, and c and d are both set to nil.

If you provide too many values, the extra ones are silently discarded, eg.
The values 2, 3, 4, 5, 6 are just discarded.

Lua Assignment A B Or C E

See Also ...

Lua keywords/topics

Lua Assignment A B Or C D

break
comments
data types
do
for (generic)
for (numeric)
function
identifiers
if / then / else
keywords
local
logical operators
precedence
relational operators
repeat
return
string literals
tables
while

Topics

Lua base functions
Lua bc (big number) functions
Lua bit manipulation functions
Lua coroutine functions
Lua debug functions
Lua io functions
Lua LPEG library
Lua math functions
Lua os functions
Lua package functions
Lua PCRE regular expression functions
Lua script extensions
Lua SQLite (database) interface
Lua string functions
Lua syntax
Lua table functions
Lua utilities
Scripting
Scripting callbacks - plugins

(Help topic: lua=assignment)