Template:Ifwpc/doc

This template compares branching methods with and without Extension:ParserFunctions.

It shows, for all 27 possibilities of three parameters being non-empty, empty or undefined, the result of Template:Ifwp, #if with empty strings as default, and the concatenation of Template:Ifdef and Template:Ifndef.

Code:

{{{3{{{1|}}}|{{{1{{{1|}}}|{{{2|}}}}}}}}},{{#if:{{{1|}}}|{{{2|}}}|{{{3|}}}}},{{{1{{{1|}}}|{{{2|}}}}}}{{{3{{{1|}}}|}}}

Code	Result
{{ifwpc|x|y|z}}	y,y,y
{{ifwpc||y|z}}	z,z,z
{{ifwpc|x||z}}	,,
{{ifwpc|x|y|}}	y,y,y
{{ifwpc|x||}}	,,
{{ifwpc||y|}}	,,
{{ifwpc|||z}}	z,z,z
{{ifwpc|||}}	,,
{{ifwpc|2=y|3=z}}	z,z,yz
{{ifwpc|1=x|3=z}}	,,
{{ifwpc|x|y}}	y,y,y
{{ifwpc|2=|3=z}}	z,z,z
{{ifwpc|1=|3=z}}	z,z,z
{{ifwpc||y}}	,,
{{ifwpc|2=y|3=}}	,,y
{{ifwpc|1=x|3=}}	,,
{{ifwpc|x|}}	,,
{{ifwpc|2=|3=}}	,,
{{ifwpc|1=|3=}}	,,
{{ifwpc||}}	,,
{{ifwpc|x}}	,,
{{ifwpc|2=y}}	y,,y
{{ifwpc|3=z}}	z,z,z
{{ifwpc|}}	,,
{{ifwpc|2=}}	,,
{{ifwpc|3=}}	,,
{{ifwpc}}	,,

All differences between the three methods occur with {{{1}}} undefined and {{{2}}} non-empty, in which case the codes reduce to:

{{{3|{{{2}}}}}},{{{3|}}},{{{2}}}{{{3|}}}

Code	Result
{{ifwpc|2=y|3=z}}	z,z,yz
{{ifwpc|2=y|3=}}	,,y
{{ifwpc|2=y}}	y,,y

Differences between undefined and empty (which may or may not be desirable) occur in two methods with {{{2}}} non-empty, and {{{1}}} and {{{3}}} each empty or undefined, in which case the codes reduce to:

{{{3|{{{1|{{{2}}}}}}}}},,{{{1|{{{2}}}}}}

Code	Result
{{ifwpc||y|}}	,,
{{ifwpc||y}}	,,
{{ifwpc|2=y|3=}}	,,y
{{ifwpc|2=y}}	y,,y

Substitution

Substitution works for all three methods.

See also

• Template:Ifold