Template:Ifdef/doc
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This is a  documentation subpage for Template:Ifdef.It contains usage information, categories and other content or metadata that is not part of the original template. |
This template provides branching without Extension:ParserFunctions for simple "if defined then do" statements without else part. It is the opposite of Template:Ifndef.
See Template:Ifwpc for an overview of results, and comparisons.
Usage
{{ifdef|value|result}}
yields result if value isn't blank.
It uses the code {{{1{{{1|}}}|{{{2|}}}}}}.
Examples
| Code | Result |
|---|---|
{{ifdef|x|y}}
|
y |
{{ifdef||y}}
|
|
{{ifdef|2=y}}
|
y |
{{ifdef|x}}
|
|
{{ifdef|}}
|
|
{{ifdef}}
|
Substitution
Convenient of the parameter default mechanism is that substitution works also, without any extra code.