How can I implement a timeout for a promise in JavaScript?

How can I implement a timeout for a promise in JavaScript?

You can create a timeout for a promise by using the Promise.race() method along with a timeout promise.

Can you show me an example of that?

Sure! Here's a simple example:

function timeoutPromise(ms) {
    return new Promise((_, reject) => {
        setTimeout(() => reject(new Error('Timeout!')), ms);
    });
}

function fetchData() {
    return new Promise((resolve) => {
        setTimeout(() => resolve('Data fetched!'), 2000);
    });
}

Promise.race([fetchData(), timeoutPromise(1000)])
    .then(data => console.log(data))
    .catch(err => console.error(err.message));

What happens if the fetchData promise resolves before the timeout?

If fetchData resolves before the timeout, the resolved value will be returned, and the timeout promise will be ignored.