[Node.js] Solution to http://letsrevolutionizetesting.com/challenge

rainforestqa solution

/**
 * Requirements: Node.js, npm
 * $ npm install request-json
 */

request = require('request-json');
var client = request.newClient('http://letsrevolutionizetesting.com');
var ids = [];

client.get('challenge', function(err, res, body) {
  ids.push( body.follow.replace(/\D/g,'') );

  var get_next = function(id) {
    client.get('challenge?id=' + id, function(err, res, body) {
      
      // still following the trail?
      if (body.follow) {
        var follow = body.follow.replace(/\D/g, '');
        ids.push(follow);

        if (ids.indexOf(follow) != -1) {
          get_next(last_id());
        }
      }

      // success, we've reached the end!
      else {
        console.log('IDs collected: %d', ids.length);
        console.log(body.message);
      }
    });
  };

  // get the IDs!
  console.log('Retrieving IDs...');
  get_next(last_id());

});

function last_id() {
  return ids[ids.length-1];
}