Custom CommandOther
Expressions
Some functions such as $if require expressions to implement dynamic, conditional logic.
Expression Structure
An expression compares a left-hand side to a right-hand side using an operator.
Left-Side[Operator]Right-SideOperators
| Operator | Description |
|---|---|
== | Equality (ignores surrounding whitespace) |
=== | Exact equality (including whitespace) |
!= | Inequality (ignores surrounding whitespace) |
!== | Exact inequality (including whitespace) |
> | Greater than (numeric) |
>= | Greater than or equal to (numeric) |
< | Less than (numeric) |
<= | Less than or equal to (numeric) |
&& | Logical AND (both sides must be true) |
|| | Logical OR (at least one side must be true) |
Complex Expressions
You can build complex logic by combining multiple conditions.
- AND (
&&): Evaluates astrueonly if both conditions are met. - OR (
||): Evaluates astrueif at least one condition is met.
Grouping
Use parentheses () to explicitly define the order of evaluation. Expressions within parentheses are evaluated as a unit before other operators.
Examples
- Simple:
A!=B - Complex:
A == A||true!=false&&1>0 - Complex With Grouping:
(A == A||true!=false)&&1>0