Wikipedia:Articles for deletion/Number validation in VB 6
The applicable policies are probably  and OTHOWTO point 4. On the face of it, the subject matter has the multiple non-trivial references satisfying notability. The article presents as information rather than as "textbooks, with leading questions and systematic problem solutions as examples" and so good argument can be made that it satisfies the NOTHOWTO advice. And though I can kinda see reasons for not wanting to dissect in minute detail on wikipedia every software platform, I'm persuaded by NOTHOWTO's "Other kinds of examples, specifically those intended to ''inform'' rather than to ''instruct'', may be appropriate for inclusion in a Wikipedia article", the quality of the subject article, and the fact that it discusses the function in the context of a range of platforms. I suspect, however, that other non-microsoft platforms have ''is functions'' and thus that we're seeing only a subset of the information one might expect to inhabit the is function namespace
— User:Tagishsimon, 22:00, 19 January 2011 (UTC)
Stance: keep
Cited policy: WP:N||WP:NOTHOWTO (Wikipedia:Notability)