link-mongodb.js

let root = {
  title: async () => {
      let allArticles = [];
      // Query our mongoDB
      let articles = await Article.find();
      // Return data in appropriate format
      articles.forEach(function(item) {
          if(typeof item.title === "string") {
              allArticles.push(item.title);
          }
      });
      return allArticles;
  },
  articleAge: async () => {
      // Repeat
      let allDates = [];
      let articles = await Article.find();
      articles.forEach(function(item) {
          if(typeof item.date === "number") {
              allDates.push(item.date);
          }
      });
      return allDates;
  }
};