recursive.js

// super naive get xhr/promise implementation only tested in chrome
function req(url) {
  var x = new XMLHttpRequest();
  var success;
  var done;

  x.onreadystatechange = function () {
    if (x.readyState === 4) {
      done = JSON.parse(x.responseText);
      if (typeof success === 'function') success(done);
    }
  };

  x.open('GET', url, true);
  x.setRequestHeader('Accept', 'application/json');
  x.send('');

  return {
    then: function (cb) {
      if (done) return cb(done);
      success = cb;
    }
  };
}

// callback to recurse requests until there's no follow attribute
function cb(d) {
  if (d.follow) return req(d.follow).then(cb);
  console.log(d);
}

// kick it all off
req('http://letsrevolutionizetesting.com/challenge').then(cb);

//"Congratulations! You've reached the end! You have passed our simple little test and we would love to hear from you. Please save the \
//code you used to a private gist, and fill out the quick application form at \
//https://jobs.lever.co/rainforest/72beda5c-d340-41aa-97a3-2f0c3f272940 (if you're an engineer) or \
// https://jobs.lever.co/rainforest/62b39e56-ec39-4266-80d3-c48b47010596 (if you're a front-end developer). We'll be in touch shortly!"

// golf score 79
//a=$.getJSON,a(location,function b(c){c.follow?a(c.follow,b):alert(c.message)});