Doing a brute force search of bitwise operators to produce more efficient code: https://www.oilshell.org/blog/2016/12/27.html
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Over a sufficiently long time horizon, all code you write is legacy code.
One advantage I've come to appreciate about Dash/Zeal docsets: it's really nice having focused search.
The text search is constrained to the languages I care about enough to download the docset, substantially increasing the relevance. In Google I'd need to specify the language.
I'd heard the conventional wisdom that UX research states that mice are more efficient than keyboards, but turns out there's virtually no research on this!
https://danluu.com/keyboard-v-mouse/