async function fetchTopStories() {
let stories = {};
for (var i = 0; i < 20; i++) {
let storyId = topStoryId[i];
let storyDetailsURL = `https://hacker-news.firebaseio.com/v0/item/${storyId}.json`;
let response = await fetch(storyDetailsURL);
stories[storyId] = await response.json();
}
return stories;
}