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Subject: Re: Persistence of variables
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Eli Zaretskii <eliz@gnu.org> writes:
>> From: Emanuel Berg <moasen@zoho.com>
>> Date: Wed, 21 Mar 2018 19:00:52 +0100
>> 
>> (defun write-string-to-file (string file)
>>   "Write STRING to FILE.
>> Create nonexistent FILE otherwise overwrite."
>>   (interactive "sstring: \nFfile: ")
>>   (with-temp-file file
>>     (insert string "\n") ))
>
> We have append-to-file, which can do this out of the box.

I'm sorry to nit, but Emanuels write-string-to-file differs from
append-to-file in that it ensures the file includes (only) string while
append-to-file, well, appends string to the file at the end, if it
exists.

That makes write-string-to-file are more useful building block in the
context of the question of the OP, IMHO. But it's musing anyway.