GitHub is developing a mobile app for both iOS and Android: https://github.blog/2019-11-13-universe-day-one/#mobile
Their site works well on mobile browsers, but this seems like a great move. There's a lot you can do from the desktop browser today that's hard from a phone.
miniblog.
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A really fun (10 minute) talk on developing an LLVM backend for 6502, a chip with only three registers and a teeny tiny stack: https://www.youtube.com/watch?v=2lW3WHPtmKo
TIL about actionlint, a static analysis tool for GitHub action YAML files: https://github.com/rhysd/actionlint
Seems really useful, developing actions can be tricky.
I really like instruction counts for measuring performance. It's not perfect, but it's a very stable metric, even if I'm listening to music whilst developing and benchmarking.