rougail-output-doc/tests/docs/no_namespace/00_9default_calculation_param_optional.md

---
gitea: none
include_toc: true
---
# dictionaries/rougail/00-base.yml

```yaml
---
version: '1.1'
var1:
  description: a first variable
  default:
    type: jinja
    jinja: '{% if var2 is defined %} {{ var2 }} {% elif var3 is defined %} {{ var3
      }} {% elif var4 is defined %} {{ var4 }} {% else %} {{ _.var2 }} {% endif %} '
    params:
      var2:
        type: variable
        variable: _.var2
        optional: true
      var3:
        type: variable
        variable: _.var3
        optional: true
      var4:
        type: variable
        variable: _.unknown_family.var
        optional: true
    description: returns a value
  mandatory: false
var2: no    # a second variable
```
# Variables

| Variable                                                                                                     | Description                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **var1**<br/>[`string`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `standard`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | A first variable.<br/>**Default**: returns a value.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| **var2**<br/>[`string`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `standard` `mandatory`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | A second variable.<br/>**Default**: no                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |


# Example with all variables modifiable

```yaml
---
var1: no
var2: no
```