SOURCE

function createObj(o) {
  let clone = Object.create(o);
  clone.sayHi = function() {
    console.log('Hi');
  }
  return clone;
}

let person = {
  name: "Kevin",
  age: 25, 
  sayHello: function() {
    console.log('Hello');
  }
}

let another = createObj(person);
another.sayHi();   // Hi
another.sayHello(); // Hello
console.log(another.name);// Kevin
console.log(another.age);  // undefined