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An illustration: the author's C++ solution takes a std::string by value, incurring an unintentional copy of the buffer. C++ makes it easy to make this mistake. C does not. But for the same reason C++ also makes it easy to use complicated objects and allocations when you need them for performance.
https://github.com/cesarvr/AOCRust/blob/590270ed268dcd4ff01b...
> I wonder if the javascript version is faster because it's less safe or because the JIT compiler identifies properly that unicode-awareness is useless and specializes the code.
Most JS VMs have several different string types internally. Looking at V8's source code (https://github.com/v8/v8/blob/master/src/builtins/builtins-s...), it looks like there's a very happy ASCII fast path that makes toLowerCase really fast on ASCII. Actually, it even looks as if it's processing the characters 8 bytes at a time (https://github.com/v8/v8/blob/master/src/strings/string-case...).
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