RethinkDB with io.js: exploring ES6 generators and the future of JavaScript

I like the article, and I look forward to ES6 generators.

However, if someone want the compactness of the second example today, CoffeeScript is another alternative:

    conn = undefined
    r.connect().then (c) ->
      conn = c
      r.dbCreate('quake').run(conn)
    .then ->
      r.db('quake').tableCreate('quakes').run(conn)
    .then ->
      r.db('quake').table('quakes')
                   .indexCreate('geometry', geo: true).run(conn)
    .then -> 
      r.db('quake').table('quakes')
                   .insert(r.http(feedUrl)('features')).run(conn)
    .error (err) ->
      console.log(err) if err.msg.indexOf('already exists') == -1
    .finally ->
      conn.close() if conn

(obviously the main benefits with generators aren't concise code, but since the article mentioned conciseness I thought I'd post the CoffeeScript equivalent)