Editing Module talk:Yesno (section)

== Option: Binary-only? ==

I want to "propose" to add an option (feature) that makes the module return '''{{code|T/F}} only, never {{code|nil}}'''. For example, it could have para {{para|whennil|&lt;True or False>}}.

The background is that there are many situations (I meet in programming Lua) where a 'nil' return value is not helpful and still has to be handled separately into binary logic.

But even better, maybe I can ''learn'' why this was not added from the start, or why it could be considered bad design/coding. Maybe it could be solved by creating a wrapper like "Module:YesnoNevernil", or is that bad design again? -[[User:DePiep|DePiep]] ([[User talk:DePiep|talk]]) 04:56, 23 December 2021 (UTC)

:It's easy enough to just handle the nil in your own code, for example: <syntaxhighlight lang="lua" inline>myvariable = yesno(value) or false</syntaxhighlight> -- [[User:WOSlinker|WOSlinker]] ([[User talk:WOSlinker|talk]]) 20:09, 23 December 2021 (UTC)
::This can also mostly be handled by specifying the default parameter (i.e. <syntaxhighlight lang="lua" inline>myvariable = yesno(value, false)</syntaxhighlight>), although this does leave the case <syntaxhighlight lang="lua" inline>yesno(nil, false)</syntaxhighlight>, which evaluates to <syntaxhighlight lang="lua" inline>nil</syntaxhighlight>. The reason I originally programmed the module this way is so that it can be mostly backwards-compatible with [[Template:Yesno]], which it is intended to replace. Originally the plan was to do a straight conversion of [[Template:Yesno]] to Lua, but it turned out that doing that was actually slower than just using the template, given the template's simplicity and the initial cost of switching between PHP and Lua. So instead this module became Lua-only, with most of the behaviour of [[Template:Yesno]]. The intention there was that module writers could easily incorporate it into modules that convert more complex templates without having to change the template logic too much. — '''''[[User:Mr. Stradivarius|<span style="color: #194D00; font-family: Palatino, Times, serif">Mr.&nbsp;Stradivarius</span>]]''''' <sup>[[User talk:Mr. Stradivarius|♪&nbsp;talk&nbsp;♪]]</sup> 22:11, 23 December 2021 (UTC)
:::OK, thx. I can use this code solution with confidence now, no research-&-test needed. Might as well add it to the /doc. -[[User:DePiep|DePiep]] ([[User talk:DePiep|talk]]) 16:35, 24 December 2021 (UTC)
::::The abovementioned <code>yesno(value) or true/false</code> has a common pitfall and should be avoided: if value is "false", <code>yesno(value) or true</code> would gives "true", instead of the presumably expected "false". See section « Standard solution: and/or » on [http://lua-users.org/wiki/TernaryOperator this page]. [[User:Od1n|Od1n]] ([[User talk:Od1n|talk]]) 18:15, 22 September 2024 (UTC)