How to DEEP CLONE in Javascript?🤔👬 (4 ways in under 12 mins!)
Timestamps:
0:00 - Intro
0:06 - What is a deep clone?
01:49 - JSON.stringify JSON.parse
03:26 - Issue with JSON.stringify JSON.parse
04:30 - structuredClone
05:20 - Issue with structuredClone
05:45 - Custom Deep Clone Method
10:25 - Lodash
11:47 - Outro
You already know what this video is about from the title – today we are doing a complete deep dive into Deep Cloning in JavaScript and learning it in a practical, interview-focused way. If you have ever copied an object in JavaScript and accidentally modified the original data, this video will finally make everything crystal clear.
In JavaScript, objects are stored by reference, not by value. That means when you do something like const copy = original, you are NOT creating a real copy – both variables still point to the same memory location. This is exactly why we need deep cloning. In this video, we first understand what deep clone actually means, how it is different from shallow copy, and why beginners often face bugs because of this concept.
🔥 What You Will Learn in This Video
We cover four different approaches to deep clone an object in JavaScript, step by step with real examples:
JSON.stringify() + JSON.parse()
The most common beginner approach
Works great for simple objects
Super easy and no external library required
But has serious limitations (dates, functions, undefined, Map, Set)
Why JSON Method Fails in Real Projects
Dates turn into strings
Functions disappear
Circular references break
Special objects like Map & Set are lost
This section helps you understand WHY many interviewers don’t accept JSON cloning as a perfect solution.
structuredClone – The Modern Browser Solution
Built-in deep clone API
Handles Dates, Map, Set correctly
Much safer than JSON method
But still has browser compatibility issues and limitations with functions
Custom Deep Clone Function from Scratch
We write our OWN recursive deep clone method
Understand how deep cloning actually works internally
Handle nested objects manually
Great for JavaScript interviews and concept building
Lodash cloneDeep – Production Ready Approach
Industry standard solution
Handles almost everything
Dates, nested objects, circular references
The method used in real enterprise projects
🎯 Who Is This Video For?
College students learning JavaScript
Freshers preparing for interviews
Frontend developers using React / Angular
Anyone confused between shallow copy vs deep copy
Developers facing bugs due to object mutation
If you are preparing for JavaScript interviews, this topic is extremely important. Questions like:
“How do you deep clone an object in JavaScript?”
“Why is JSON.parse(JSON.stringify()) not reliable?”
“What is structuredClone?”
“How does Lodash cloneDeep work?”
are asked very frequently – and this single video prepares you for all of them.
🧪 Example Object Used in the Video
We demonstrate everything using a real nested object:
{
firstName: "Lionel",
address: {
city: "Rosario",
country: "Argentina"
},
joined: new Date("2004-10-16")
}
Then we modify the cloned object and check whether the original object stays safe – this practical demonstration makes the concept super easy to understand.
💡 After Watching This Video You Will
✔ Clearly understand deep vs shallow copy
✔ Know 4 different ways to clone objects
✔ Understand real-world limitations
✔ Be ready for JS interview questions
✔ Write your own deep clone logic
✔ Know which method to use in production
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#javascript #javascripttutorial #deep #clone #coding #codinginterviewprep #codingtips #frontendinterview
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