Expression syntax reference
Opus uses ZEN Expression Language for writing conditions, formulas, and logic in Decision nodes, Switch nodes, Expression nodes, and Decision Tables. This reference documents all supported operators, functions, and data types.
Operators
Arithmetic
| Operator | Description | Example | Result |
|---|---|---|---|
+ |
Addition | 100 + 100 |
200 |
- |
Subtraction | 200 - 100 |
100 |
* |
Multiplication | 10 * 10 |
100 |
/ |
Division | 100 / 10 |
10 |
% |
Modulo | 10 % 3 |
1 |
Comparison
| Operator | Description | Example | Result |
|---|---|---|---|
== |
Equal | 10 == 10 |
true |
!= |
Not equal | 10 != 5 |
true |
> |
Greater than | 10 > 5 |
true |
>= |
Greater than or equal | 10 >= 10 |
true |
< |
Less than | 5 < 10 |
true |
<= |
Less than or equal | 5 <= 10 |
true |
Logical
| Operator | Description | Example | Result |
|---|---|---|---|
and |
Logical AND | true and false |
false |
or |
Logical OR | true or false |
true |
not |
Logical NOT | not true |
false |
Ternary
condition ? valueIfTrue : valueIfFalseExample: age >= 18 ? "adult" : "minor"
Data type reference
For detailed functions and examples per data type, refer to the sub-pages:
| Data type | What it covers |
|---|---|
| String | Concatenation, case conversion, pattern matching, extraction (len, upper, lower, contains, matches) |
| Number | Arithmetic, rounding (floor, ceil, round), absolute values, random numbers |
| Boolean | Logical operators, comparisons, ternary expressions |
| Date and time | Parsing, formatting, date arithmetic, component extraction (year, month, day) |
| Array | Aggregation (sum, max, min), filtering, mapping, sorting |
| Context | Accessing input data, variables, and upstream node outputs |
The individual data type pages from the source repo (
4.decision/expression-language/) should be restructured to match this reference and placed in anexpression-syntax-reference/subfolder. [VERIFY: confirm file paths with writer before restructuring]
