Day 2: Promises (then, catch, finally)

Daily Objective

Handle asynchronous outcomes using Promises and chain transformations cleanly.

1. Promises

const fetchData = new Promise((resolve, reject) => {
  const success = true;
  if (success) resolve('Data retrieved successfully');
  else reject(new Error('Network failure'));
});

fetchData
  .then(data => console.log(data))
  .catch(err => console.error(err.message))
  .finally(() => console.log('Operation finished'));

Daily Hands-on Practice (70%)

1. Write a function returning a Promise that resolves after a specified delay: sleep(ms).