Operators
Operators
An operator is a special set of symbols used to perform an operation or conditional evaluation.
Logical
The logical operators for articles/Conditional Statements in Lua|conditional statements are and, or, and not. These operators consider both false and nil as “false” and anything else as “true.”
| Operator | Description |
|---|---|
and |
Evaluates as true only if both conditions are true |
or |
Evaluates as true if either condition is true |
not |
Evaluates as the opposite of the condition |
Relational
Relational operators compare two parameters and return a articles/Boolean|boolean true or false.
| Operator | Description | Associated metamethod |
|---|---|---|
== |
Equal to | __eq |
~= |
Not equal to | |
> |
Greater than | |
< |
Less than | __lt |
>= |
Greater than or equal to | |
<= |
Less than or equal to | __le |
Arithmetic
Lua supports the usual binary operators along with exponentiation, modulus, and unary negation.
| Operator | Description | Example | Associated metamethod |
|---|---|---|---|
+ |
Addition | 1 + 1 = 2 | __add |
- |
Subtraction | 1 - 1 = 0 | __sub |
* |
Multiplication | 5 * 5 = 25 | __mul |
/ |
Division | 10 / 5 = 2 | __div |
^ |
Exponentiation | 2 ^ 4 = 16 | __pow |
% |
Modulus | 13 % 7 = 6 | __mod |
- |
Unary negation | -2 = 0 - 2 | __unm |
Miscellaneous
Miscellaneous operators include concatenation and length.
| Operator | Description | Associated metamethod |
|---|---|---|
.. |
Concatenates two strings | __concat |
# |
Length of articles/Table|table |
__len |