invoking an async function multiple times in regular sequence

invoke-async-multiple-times-in-regular-sequence.js

const af = n => {
    return new Promise(res => {
        setTimeout(() => {
            console.log(n);

            res();
        }, 200 * n);
    })
};

(async () => {
    console.log("start");

    await Promise.all([0, 1, 2, 3, 4].map(async n => {
        await af(n);

        console.log("done: ", n);
    }));

    console.log("end");
})();