Template:Ifndef/doc
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This is a  documentation subpage for Template:Ifndef.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 void else do" statements with blank then part. It is the opposite of Template:Ifdef.
Usage
{{Ifndef|value|result}}
yields result if value is blank.
It uses the code {{{2{{{1|}}}|}}}
See Template:Ifwpc for an overview of results, and comparisons.
Examples
| Code | Result |
{{Ifndef|x|y}}
|
|
{{Ifndef||y}}
|
y |
{{Ifndef|2=y}}
|
y |
{{Ifndef|x}}
|
|
{{Ifndef|}}
|
|
{{Ifndef}}
|
Substitution
Convenient of the parameter default mechanism is that substitution works also, without any extra code.