How to handle promise errors?

Promises have a built-in mechanism for handling errors, known as the rejection handler. This allows developers to specify a separate callback function for handling rejected promises, rather than having to use the second argument of the then() method as a catch-all error handler.

// promise way with .catch method
function delayedFn(ms) {
    return new Promise((resolve, reject) => {
        console.log('Running a promise with status: pending')
    
        if (ms < 1000) {
            reject('Too little time - It must be more than 1000 ms!');
        } else {
            setTimeout(() => resolve(ms), ms);
        }
    });
}

delayedFn(900)
    .then((ms) => console.log(`Promise with status: fulfilled; after: ${ms} ms!`))
    .catch(err => console.error('Promise with status: rejected and error', err))
    .finally(() => console.log('Always works!'))

// try catch way:
async function handleDelayedFn(ms) {
    try {
        const result = await delayedFn(ms);
        
        console.log(`Promise with status: fulfilled; after: ${ms} ms!`);
    } catch(err) {
        console.error('Promise with status: rejected and error', err);
    } finally {
        console.log('Always works!');
    }
}
handleDelayedFn(900);