User:Patrick/pstp/doc
< User:Patrick | pstp
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This is a parameter selection template. It returns the value of the parameter whose name is the value of parameter p.
Usage
[edit]{{User:Patrick/pstp|a=fa |b=fb |p=a}}→ fa{{User:Patrick/pstp|a=fa |b=fb |p=b}}→ fb
Thus {{User:Patrick/pstp|p={{{1}}}|a=fa|b=fb|..}} can represent any function f given by a set of pairs (a,fa), (b,fb), .. , except that these cannot include a pair (p,fp). To allow the latter also, we can use {{User:Patrick/pstp|p=q{{{1}}}|qa=fa|qb=fb|..}}.
m:Template:Ppp is identical.