function callGithubRepo(callback) {

  var httpRequest = new XMLHttpRequest();

​

  httpRequest.onreadystatechange = function() {

    if (httpRequest.readyState === XMLHttpRequest.DONE) {

      if (httpRequest.status === 200) {

        callback(JSON.parse(httpRequest.responseText));

      }

    }

  };

  httpRequest.open('GET', 'https://api.github.com/repos/jquery/jquery/issues/1');

  httpRequest.send();

}

​

function onSuccess(data) {

  console.log("The first issue on jquery is from: " + data.user.login);

  console.log("and its state is: " + data.state);

}

​

console.log("We will call the github api for the jquery repo...");

callGithubRepo(onSuccess);

console.log("The call is asynchronous...");