Template talk:Ifndef

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Usage

{{Ifndef|value|result}} yields result  if value  is blank.

This simple template cannot be substituted, it's used to simplify the following equivalent but somewhat cryptic (names don't matter) code variants:

{{{2{{{1|}}}|}}}
{{{result{{{value|}}}|}}}
{{{then{{{test|}}}|}}}


Example

Code Result
1 {{Ifndef| |empty}} 1 empty
2 {{Ifndef|x|gotcha}} 2
3 {{Ifndef| {{{1| }}} | {{{1| }}} undefined}} 3 undefined
4 {{Ifndef| {{{1  }}} | {{{1  }}} bad idea}} 4
5 {{Ifndef| {{ns:0}} | main namespace}} 5 main namespace

Unlike ifdef the minimalistic ifndef cannot reject a missing second parameter.


For more info see: meta.wikimedia.org Ifndef

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