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function startTask(interval) {
  return new Promise((resolve, reject) => {
    let timer = setInterval(() => {
      console.log('doing something...');
    }, interval);

    setTimeout(() => {
      clearInterval(timer);
      resolve('Task completed successfully');
    }, 5000);
  });
}

startTask(1000)
  .then((result) => {
    console.log(result);
  })
  .catch((error) => {
    console.error(error);
  });

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