…”. You write your code naturally, then you measure it. If there are performance problems, fix them. We don’t need to prove an inline arrow function is fast, somebody else needs to prove it’s slow. Otherwise it’s a premature optimization.
I also built in some general common sense: people with aol email addresses are sloppy typers. Daryls tend to poke at the keys with only their index fingers like they’re afraid each key will burn them. People with ‘z’ in their name use mechanical keyboards and rarely make mistakes. Your basic human axioms.