xhr promises

request.js

function xhrPromise() {
  return new Promise(function(resolve, eject) {
    var xhr = new XMLHttpRequest();
    
    xhr.onreadystatechange = onready;
    xhr.open("GET", "https://api.github.com/users/zzarcon");
    xhr.send();

    function onready() {
      if (xhr.readyState == 4 && xhr.status == 200) {
        var json = JSON.parse(xhr.responseText);
        
        resolve(json);
      }  
    }
  });
}

xhrPromise().then(callback);

function callback(user) {
  console.log(user.name)
}