Amberlamps

interface AbstractionLayer {
  createUser();
}

class MongoDbAdapter implements AbstractionLayer {
  createUser() {
    // Mongodb specific code
  }
}

Amberlamps

const ClientWrapper = require('./mongo-client-wrapper.js');

ClientWrapper("url/to/mongodb").then((db) => {
  db.insert();
});

Amberlamps

app.post('/comments', (req, res, next) => {
  try {
    const { userId, postId } = req.body;

    const comment = db.createCommentSync(req.body);

    const post = db.getPostSync(postId);
    db.updatePostSync(postId, { comments: post.comments + 1 });

    const user = db.getUserSync(userId);

Amberlamps

app.get('/users/:userId', (req, res) => {
  db.getUserAsync(req.params.userId, (err, user) => {
    db.getPostsByUserAsync(user.id, (err, posts) => {
      db.getCommentsByPostsAsync(posts, (err, comments) => {
        res.json(mergeData(user, posts, comments));
      });
    });
  });
});

Amberlamps

app.get('/users', (req, res) => {
  const users = db.getUsersAsync((err, data) => {
    console.log(data);
    
    return data;
  });
  
  res.send(users);
});

Amberlamps

.navigation li[data-selected] {
 font-weight: bold;
}

Amberlamps

function resolveKeyString(obj, keyString) {
  return keyString.split('.').reduce(function(p, c) {
    return p[c];
  }, t);
}

// Usage:
var obj = {
  a: {
    b: {