promises.js

// As long as the functions work on Promise values, you don't need to use `.then/.chain`.
// In fact, I'd say that using `.then` directly is usually an anti-pattern, as you can easily liftN(fn)
var tweets   = getTweetsFor("swannodette")
var firstUrl = expandUrl(first(parseUrls(tweets)))
var response = httpGet(firstUrl)

response.then(function(data)  { console.log("Most recent link text: ", data) }
             ,function(error) { console.log("Error with the twitterverse: ", error) })

/* The CLJS 
   ;; would be easy to achieve with do-syntax macros for monads in JS, with sweet.js or something
   ;; But still fairly nice eh. I wonder how the try/catch construct is compiled by the `go` macro.

(go (try
      (let [tweets    (<? (get-tweets-for "swannodette"))
            first-url (<? (expand-url (first (parse-urls tweets))))
            response  (<? (http-get first-url))]
        (. js/console (log "Most recent link text:" response)))
      (catch js/Error e
        (. js/console (error "Error with the twitterverse:" e)))))

*/