//console.log('hello world');

var a = (function () {
  'use strict';
  var request,
    response;

  return {
    get: function (source) {
      request = new XMLHttpRequest();
      request.open('GET', source, true);
      request.setRequestHeader(
        'Content-Type',
        'application/x-www-form-urlencoded; charset=utf-8'
      );
      request.send();

      request.onreadystatechange = function () {
        if (request.readyState === 4 && request.status === 200) {
          response = request.responseText;
        } else { response = false; }
        return response;
      };
      return request;
    }
  };
}());

var b = (function () {
  'use strict';
  return {
    set: function (source) {
      var response = a.get(source);
      console.log(response);
      return response;
    }
  };
}());


var c = b.set('x.txt');

console.log(c.readyState);