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var obj = {
    name: 'Barbara',
    age: 29,
    car: 'Honda'
};

var newObj = {
    ...obj,
    name: 'Kasia',
    pet: 'dog'
};

console.log(newObj); //{name: "Kasia", age: 29, car: "Honda", pet: "dog"}
console.log(obj); //{name: "Barbara", age: 29, car: "Honda"}

// deep nested merging object
const data = {
  firstLevel: {
    name: 'level 1',
    secondLevel: {
      name: 'level 2',
    }
  }
};

const merged = {...data, firstLevel: {...data.firstLevel, secondLevel: {...data.firstLevel.secondLevel, name: `I'm a switched level!`}}}