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This template tests whether the first unnamed parameter is equal to the second unnamed parameter and returns the third unnamed parameter if it does. Otherwise it returns the first unnamed parameter.
This is useful when the first parameter is a {{#invoke: }} of a Lua module that returns a value for which a specific exception is required. Because it uses the {{#invoke: }} just once, it simplifies the coding of infoboxes, for example.
Usage
An infobox field may return the Script error: No such module "wd". (P17) for an article about a city. We may wish to use the abbreviation "USA" in place of "United States".
- Script error: No such module "wd". (P17) for Script error: No such module "wd". (Q42462)
{{#invoke:WikidataIB |getValue |P17 |qid=Q42462 |fwd=ALL |osd=no |rank=best |noicon=true}}→ Script error: No such module "WikidataIB".{{Ifnoteq then show|{{#invoke:WikidataIB |getValue |P17 |qid=Q42462 |fwd=ALL |osd=no |rank=best |noicon=true}}|United Kingdom|UK}}→ Script error: No such module "WikidataIB".
- Script error: No such module "wd". (P17) for Script error: No such module "wd". (Q60)
{{#invoke:WikidataIB |getValue |P17 |qid=Q60 |fwd=ALL |osd=no |rank=best |noicon=true}}→ Script error: No such module "WikidataIB".{{Ifnoteq then show|{{#invoke:WikidataIB |getValue |P17 |qid=Q60 |fwd=ALL |osd=no |rank=best |noicon=true}}|United States|USA}}→ Script error: No such module "WikidataIB".