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

http://rethinkdb.com/blog/rethinkdbdash-iojs/

by mglukhovsky • 12 years ago

67 4 12 years ago

sandstrom2• 12 years ago

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)

espadrine• 12 years ago

JS' fat arrow is also coming, which would give a similarly succinct code.

Bahamut• 12 years ago

That can be done via ES6 as well, replacing -> with => and adding parentheses for those lambdas.

sandstrom2• 12 years ago

True! The only difference are implicit returns and significant whitespace I guess (and trailing same-line conditionals).

(think it'll even have the skinny arrow, the fat one binds `this` too)

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

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