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I loved Ruby, but unfortunately it didn't hold on to any kind of "killer app" role after Rails clones showed up in other language. I've switched to Elixir/Phoenix in that space and not looked back.

With the rise in ML and data science over the past years, Python finally has a killer app that no other scripting languages come close to touching. I migrated completely from Ruby when I started dabbling in ML, Pandas, etc.

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