newbing hard on passing the return value of functions

app.js

Session.prototype.initialize = function() {
  this.bind("change:id", this.onIDChange, this);
  if (localStorage.getItem("id" === !null || "")) {
    return this.set({
      id: localStorage.getItem("id")
    });
  } else {
    console.log("ID not found: " + (this.toJSON()));
    this.set({
      id: this.getNewID()
    });
    return console.log(this.toJSON());
  }
};

Session.prototype.getNewID = function() {
  return $.ajax({
    url: "http://localhost:1337/temp-accounts",
    type: 'POST',
    dataType: "json",
    data: {},
    success: function(data) {
      var newID;
      if (data.err) {
        return console.log(data.err);
      } else {
        newID = data.data._id;
        return newID;
      }
    }
  });
};