CODE EXAMPLE FOR JAVASCRIPT

javascript object prototype

function listAllProperties(o) {
  let objectToInspect = o;
  let result = [];

  while(objectToInspect !== null) {
    result = result.concat(Object.getOwnPropertyNames(objectToInspect));
    objectToInspect = Object.getPrototypeOf(objectToInspect)
  }

  return result;
}