promises

var request = require("request");
var userDetails;
function initialize() {
  return new Promise(function(resolve, reject) {
    // Do async job
    request.get("https://api.github.com/users/tkssharma", function(err,resp,body) {
      if (err) {
        reject(err);
      } else {
        resolve(JSON.parse(body));
      }
    });
  });
}
function main() {
  var initializePromise = initialize();
  initializePromise.then(
    function(result) {
      userDetails = result;
      console.log("Initialized user details");
      // Use user details from here
      console.log(userDetails);
    },
    function(err) {
      console.log(err);
    }
  );
}
main();