promise_1.js

function getGuides() {
  let ids = [...Array(10).keys()];
  
  return ids.reduce((accumulator, id) => {
     return accumulator.then(results => {
       return fetch(id).then(result => {
         results.push(result);
         return results;
       });
     });
  }, Promise.resolve([]));
  
  for (let i = 1; i <= 10; i++) {
    let res = await fetch(`/api/2.0/guides/${i}`);
    results.push(res);
  }
  
  return results;
}

getGuides().then(guides => console.log(guides));