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The JavaScript Interview Handbook: 100+ Interview Questions

Challenge: Shallow to Deep

Explore the difference between shallow and deep copying of objects in JavaScript. Learn to modify code so changes to a copied object do not affect the original, helping you grasp important concepts to avoid bugs related to object mutation.

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Problem statement

Study the code below and run it.

Node.js
const girl = {
  name: 'Anna',
  info: { age: 20, number: 123 }
};
const newGirl = { ...girl };
newGirl.info.age = 30;
console.log(girl.info.age)

As ...