[JS-Interview] Problem 1

blog_articles_render.js

function getRandomBool(n) {
  var maxRandomCoeff = 1000;
  if (n > maxRandomCoeff) n = maxRandomCoeff;
  return Math.floor(Math.random() * maxRandomCoeff) % n === 0;
}

function renderArticle(article){
  console.log(`Rendered ${article}`);
}

//api to fetch a single article
function getArticle(articleId) {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      if (getRandomBool(2)) {
        reject(`Failed article ${articleId}`);
      } else {
        resolve(`Resolved article ${articleId}`);
        // console.log(`resolving article ${articleId}`);
      }
    }, Math.random() * 1000);
  });
}

function getArticleIds(page) {
  let ids = [];
  const pageSize=10;
  for (let i=0; i<pageSize; i++) {
    ids.push(page*pageSize + i);
  }
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      resolve(ids);
    }, Math.random() * 1000);
  });
}


// An article should only be rendered only when all previous articles have been rendered.
// Fetch all articleIds and then render all articles as fast and efficiently as possible.