Is there any place, either here or on another site, to offer up code for useful macros?
I have(in LO Basic) a macro that provides VarArg (lists of parameters) capabilities to macros, and a macro to find the selected sheets in a spreadsheet.
Quick Googling showed me nothing, so I wrote them; I can share them so others don’t have to.
or
https://wiki.documentfoundation.org/Development/Extension_Development
or you can just create a post your code here with clear title and tags so that next google-rs will find it 
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I have found most solutions via web search and forum posts here, OpenOffice, StackOverflow, as well as some blogs and other sources…some going back many years. As fpy says, post it with clear title (e.g. problem it solves, function it does), or maybe add to another existing forum thread onthe topic encountered during research - persistent google-rs will find it 
There is a section for code-snippets at the following forum: