Why you might not want to build a feature on top of SQLite: https://wiki.mozilla.org/Performance/Avoid_SQLite_In_Your_Next_Firefox_Feature (sqlite is very versatile, good to hear the downsides)
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I find myself writing .iter().map(|x| ...).collect() really often in Rust. I'm wondering if I should write a helper method on Vec, but it seems less idiomatic.
Iterators compose, but they're less versatile (no indexing) and awkward to return from functions.
Programmatically refactoring JavaScript: https://www.toptal.com/javascript/write-code-to-rewrite-your-code (really neat, versatile tooling)
I'm moving from ace-jump to avy. avy is a little more versatile, actively maintained, and can be configured to be a drop-in replacement.