Escape callback hell with macros! It takes only 15 lines of wisp to solve this problem forever!! Excited ? Checkout https://github.com/Gozala/wisp

async.cljs

(defmacro =>
  [& operations]
  `(fn [callback]
     ~(reduce-list
      (reverse operations)
      (fn [form operation]
        (cons
         (first operation)
         (concat-list
          (cons 'result (rest operation))
          `((fn [error result]
              (if error
                (callback error)
                ~form))))))
      '(callback error result))))


(=>
 (read-file "passwords.txt")
 (connect-to db)
 (run-query "select * from bar")
 (write content))

async.js

undefined;

function(callback) {
  return readFile(result, "passwords.txt", function(error, result) {
    return error ?
      callback(error) :
      connectTo(result, db, function(error, result) {
        return error ?
          callback(error) :
          runQuery(result, "select * from bar", function(error, result) {
            return error ?
              callback(error) :
              write(result, content, function(error, result) {
                return error ?
                  callback(error) :
                  callback(error, result);
              });
          });
      });
  });
}