// Helper function to simulate an API call
function fetchData(id) {
  return new Promise(resolve => {
    setTimeout(() => resolve(`Data for ID ${id}`), 1000);
  });
}

// Sequential operation - takes ~3 seconds
async function fetchSequential() {
  console.time('sequential');
  const data1 = await fetchData(1);
  const data2 = await fetchData(2);
  const data3 = await fetchData(3);
  console.timeEnd('sequential');
  return [data1, data2, data3];
}

// Parallel operation - takes ~1 second
async function fetchParallel() {
  console.time('parallel');
  const results = await Promise.all([
    fetchData(1),
    fetchData(2),
    fetchData(3)
  ]);
  console.timeEnd('parallel');
  return results;
}

// Demo
async function runDemo() {
  console.log('Running sequentially...');
  const seqResults = await fetchSequential();
  console.log(seqResults);
  
  console.log('\nRunning in parallel...');
  const parResults = await fetchParallel();
  console.log(parResults);
}

runDemo();