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Jul 11 2019, 2:09 PM PST 2 min

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
Tags:
  • lua
  • operator