Show how to use promises

promises.js

const fetchData = () => {
  return new Promise((resolve, reject) => {
      // Here we are simulating an action that would likely take time, basically it doesn't run immediately
    //   it could be something like long calculations, fetching data from a server, writing data to a file, etc ...
    setTimeout(() => {
      const success = true; // this is just to simulate a successful action
      if (success) {
        // if we succeed then we mark as resolved
        resolve('Data fetched successfully!');
      } else {
        // else we reject because the promise wasn't fullfilled
        reject('Failed to fetch data.');
      }
    }, 2000); 
  });
};

// Then yiu use the fetchData this way
fetchData()
  .then((message) => {
    console.log(message); // Data fetched successfully!
  })
  .catch((error) => {
    console.error(error);  // Failed to fetch data.
  }).finally(() => {
    // this will run regardless of the outcome of the promise, consider it like deadline yafika whether you did what was agreed or not here it doesn't matter, it finished
  });


//   You could also do it this way. this is equivalent to the above code 
async function someFetch() { // Note the async keyword used here
   try {
    const result = await fetchData(); // also note the await keyword used here
    // result here will contain the resolved response from the promise
    console.log(result); // Data fetched successfully!
   } catch (error) {  // Failed to fetch data.
    // error will contain the rejected response from the promise
   } finally {
    // this will run regardless of the outcome of the promise
   }
}