1const asyncOperation = () => {
2    return new Promise((resolve, reject) => {
3        setTimeout(()=>{resolve("hi")}, 3000)
4    })
5}
6
7const asyncFunction = async (callback) => {
8    let res = await asyncOperation();
9    callback(res);
10}
11
12const topDog = () => {
13    let callback = (res) => {
14        console.log(res);
15    };
16
17    (async () => {
18        await asyncFunction(callback)
19    })()
20}
21