window.dataLayer = (function () {

  var parsedJsonResponse;

  var dataCall = function () {

    return new Promise((resolve, reject) => {

​

      var xhttp = new XMLHttpRequest();

      xhttp.onreadystatechange = function () {

        if (this.readyState == 4) {

          if (this.status == 200) {

            resolve(this.responseText);

          } else {

            console.log(this.status + '.....' + this.statusText)

          }

        }

      };

​

      xhttp.open("GET", "https://jsonplaceholder.typicode.com/posts/1", true);

      xhttp.send();

    })

​

  }

​

  var getAsyncData = dataCall().then((CallResponse) => {

    getData(CallResponse)

​

  });

​

  var getData = function (cData) {

    jsonResponse = cData.replace(/'/g, '"');

    parsedJsonResponse = JSON.parse(this.jsonResponse);

    var appData = parsedJsonResponse['content'];

​

    console.log(parsedJsonResponse);

  }

  var appData = function (applicationContent) {

    var appData = parsedJsonResponse['content'];

    console.log(appData)

  }

​

  return {

    appData: appData,

    dataCall: dataCall,

    getAsyncData: getAsyncData

  }

​

}())

​

dataLayer.getAsyncData.then(() => {

  dataLayer.appData();

});