Operator
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Operators
Logical
The word "truthy" in the following table refers to anything that isn't nil or false.
| Operator | Simple description | Technical Description |
|---|---|---|
| a and b | Return true only if a and b are true | Return b if a is truthy, otherwise return a |
| a or b | Return true if either a or b is true | Return a if a is truthy, otherwise return b |
| not a | Return the opposite of a | Return false if a is truthy, else return true |
Comparative
Comparative operators are operators that compare two parameters and return a boolean. There are several operators.
| Operator | Name | Associated metamethod |
|---|---|---|
| == | Equal to | __eq |
| ~= | Not equal to | |
| > | Greater than | |
| < | Less than | __lt |
| >= | Greater than or equal to | |
| <= | Less than or equal to | __lte |
Mathematic
Main article: Arithmetic Operators
Mathematic operators are operators that perform an arithmetic operation on their operands.
| Operator | Name | Example | Associated metamethod |
|---|---|---|---|
| ^ | Exponentiation | 2 ^ 4 = 16 | __pow |
| - | Unary negation | -2 = 0 - 2 | __unm |
| * | Multiplication | 5 * 5 = 25 | __mul |
| / | Division | 10 / 5 = 2 | __div |
| % | Modulus | 13 % 7 = 6 | __mod |
| + | Addition | 1 + 1 = 2 | __add |
| - | Subtraction | 1 - 1 = 0 | __sub |
Miscellaneous
Miscellaneous operators are operators that perform a task that cannot be categorized as the other three types.
| Operator | Name | Associated metamethod |
|---|---|---|
| = | Assignment | |
| x .. y | Concatenation | __concat |
| #x | Length of table | __len |
| x(...) | Invocation | __call |
| x[y] or x.z | Indexing | __index / __newindex |
