Logstash with Kibana (after the initial learning hassle) is excellent for numerical data. It's a replacement for Graphite in some cases.
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Learning software development through playing and contributing to a MUD: https://tashian.com/articles/how-i-learned-to-program/
I'm having fun writing a simple type checker, but I'm learning firsthand why syntax-directed checking doesn't work. It prevents inference.
My checker catches real bugs, but it can't handle cases like this:
[1, 2].map(fun(x) { x + 1; })
I think I need bidirectional checking.
The Matter protocol is excellent for puns.
"Does it Matter? It doesn't Matter."