Also explains why PHP proliferated.

Until it's time to do production level stuff, then the rust-compiler becomes a missed friend!!!!!!!!

JavaScript won because it builds up on an incredible runtime and environment that handles system level interactions (including mutexes). Browsers are astonishing pieces of software

Python was defacto single threaded too because of GIL

Dart is also single threaded

I don't know the context of your post, but of course mutex is useful in JS.

If you have an async function inside your function, you could need a mutex

Simple example is spend money, call this function 2 times in a short time and your user could spend money he doesn't have

async function spendMoney(amount) {

const balance = await getBalance()

if (balance > amount)

await spend(amount)

}

might want to check out elixir and erlang. the only well designed multi thread VM.