Since AlphaZero isn't open source, a group of enthusiasts have written a public project Leela Chess Zero based on the paper. When new versions of the paper come out, they are able to refine their implementation!
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I'm surprised there aren't more interpreted languages with a first party type checker.
Python has several good type checkers, Ruby has Sorbet, and there are others.
Having zero compilation time *and* a full IDE seems like such a compelling design, at least on paper.
I really like "zero cost abstractions" as a programming language motto. It's really effective for evaluating design decisions.
I've heard it for both C++ and Rust. Are there other PL mottos that are equally helpful?
https://blog.phronemophobic.com/dewey-analysis.html is an absolutely delightful post quantifying Clojure usage.
Functions outnumber macros 20:1, the most popular single letter variable is x, and 63% of projects have zero mutable references!