The big difference when I use Rust is that in Rust every variable you accept in a function requires you to make that choice. Whereas JS it’s kind of chosen for

The big difference when I use Rust is that in Rust every variable you accept in a function requires you to make that choice. Whereas JS it’s kind of chosen for you. In your example you had to go out of your way to do it. So just a bit more mental overhead for implementing libraries. But not a huge deal.