Thanks for more examples! :public_key doesn’t appear to be in the standard lib but I take it :public_key.pem_decode returns a pem/rsa file as a tuple of lines? If so, I think I’m getting it. I’m primarily an application developer and I just couldn’t understand why you would ever not know the length of the tuple you were working with and why you would ever have a one longer than 3 or 4. I definitely need to work on my phrasing when asking questions.
sodapopcan
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cmo
One of the caching libs, cachex or nebulex, uses records. For performance reasons I presume.
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D4no0
I don’t know what you consider standard library, for me everything included in elixir and OTP is standard library, :public_key powers things like :ssl.
You always know the length of a tuple, but you don’t want necessarily to match on the tuple, simply because this becomes horrible once the tuples are huge and nested, so this is where you ideally use records or elem/2.
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sodapopcan
No that’s what I mean, but there seems to be a possible autocomplete bug in iex. Typing :us<tab> will autocomplete :user_ but typing :pub<tab> does nothing. However, if I type out :public_key. in full then hit tab, it shows me the functions. And only after typing the module in full it will start to auto complete. In any event, :pub<tab> was all I tried last night which made me think it wasn’t in stdlib 
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slouchpie
That is weird. I have the same behavior. I can not let this go. Why does :pub not “tab out” to :public? There must be a reason.
Update: I think I got it
Any module that is Application “kernel” or “stdlib” or “erts” will tab out.
Otherwise it will not.
:public_key is in its own “public_key” application.
Similarly, :pretty_pr, :os_sup and :release_handler will not tab out.
1