gistfile1.txt

function createDir(name, parent) {
  return new Promise((res, rej) => {
    console.log(`Creating ${name} with parent ${parent}`);
    res(name);
  });
}

const dirsToCreate = ['foo', 'bar', 'baz', 'boo'];

dirsToCreate.reduce(async (parentPromise, dir) => {
  let parent = await parentPromise;
  console.log(`About to create ${dir} in ${parent}`);
  let dirCreated = await createDir(dir, parent)
  console.log(`Created ${dirCreated} with parent ${parent}`);
  return dirCreated;
}, Promise.resolve('/'))