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

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---
gitea: none
include_toc: true
---
# dictionaries/rougail/00-base.yml
```yaml
---
version: '1.1'
var1:
description: a first variable
default:
jinja: '{% if var2 is defined %} {{ var2 }} {% elif var3 is defined %} {{ var3
}} {% elif var4 is defined %} {{ var4 }} {% else %} {{ _.var2 }} {% endif %} '
params:
var2:
variable: _.var2
optional: true
var3:
variable: _.var3
optional: true
var4:
variable: _.unknown_family.var
optional: true
description: returns a value
mandatory: false
var2: no # a second variable
```
# Example with all variables modifiable
```yaml
---
rougail:
var1: no
var2: no
```