包装在promise与同步功能中的异步功能

Question

So I've always wondered if there is any benefit to this. I'll give examples below.

Asynchronous function wrapped in a Promise:

(async () => {
    await new Promise((resolve, reject) => {
        fs.writeFile(filePath, dataToWrite, (error) => {
            if (error) {
                reject(error);
                return;
            }
            resolve();
        });
    });
})();

Synchronous function:

(() => {
    fs.writeFileSync(filePath, dataToWrite);
})();

The only thing I know from light reading is that the synchronous function call blocks the process until done. So for example a web server with api endpoints will not be able to process those requests until the synchronous function is done. Is this also true for the asynchronous function wrapped in a promise? If there are any differences between the two and could one give an explanation if so?

Answer 1

The synchronous function call blocks the process until done.

Yes.

Is this also true for the asynchronous function wrapped in a promise?

No, that's the point of asynchronous processing.

The await only "blocks" the execution of the code of the particular async function until the awaited promise settles, but everything else will continue running.