atomic.js

#!/usr/bin/env node

var atom = {val: 0}

timeout = 1

const f = () => {
	let state = atom.val
	let dummmy = 0
	for (let i = 0; i < 10000; i++) {
		// some computation of new state
		dummy = i 
	}
	// assign back
	atom.val = state + 1
}

setTimeout(f, timeout)
setTimeout(f, timeout)
setTimeout(f, timeout)
setTimeout(f, timeout)
setTimeout(f, timeout)
setTimeout(f, timeout)
setTimeout(f, timeout)
setTimeout(f, timeout)
setTimeout(f, timeout)
setTimeout(f, timeout)
setTimeout(() => console.log(atom), timeout + 100)