How to use a Proxy (example). Useful for debugging, as logging can be done as the object under proxy is changed for any value(s).

proxy-example

var engineer = { name: 'Joe Sixpack', salary: 50 };

var interceptor = {
  set: function (receiver, property, value) {
    console.log(property, 'is changed to', value);
    receiver[property] = value;
  }
};

engineer = Proxy(engineer, interceptor);