simplest async hello world

var promise = new Promise(function(resolve, reject) {
    function Func(){
        let y=0;
        for (let i = 1;i<100000000;i++){
            y++;
        }
        console.log(y)
        return y;
    }
    resolve(Func) // y
})

// promise.then(r => console.log(r+1))
promise.then(r => r())
console.log('Hello, world!')