How to Do Shallow & Deep Copy in JavaScript (Every Solution Explained)
In this video, we’re breaking down one of JavaScript’s most misunderstood concepts - deep cloning. It might sound straightforward, but getting it wrong can cause subtle bugs that are a nightmare to debug. If you’ve ever copied an object, changed something, and then wondered why your original data mysteriously changed too, you’ve already run into this problem.
We’ll explore why shallow copies fail when dealing with nested objects and arrays, and how JavaScript’s reference types work under the hood. Then, we’ll go step-by-step through multiple ways to fix the problem, from the quick JSON method, to writing a custom recursive function, to using Lodash’s powerful cloneDeep, and finally the modern structuredClone API.
🚀 What you’ll learn in this video:
🔹 The difference between shallow copy and deep copy
🔹 Why JavaScript objects and arrays behave unexpectedly when copied
🔹 Several approaches to deep cloning, from basic to advanced
🔹 The pros and cons of JSON stringify/parse, custom functions, Lodash, and structuredClone
🔹 How to avoid data mutation bugs in real-world applications
⏱ Timeline
0:00 – Welcome & what you’ll learn today
0:13 – Why deep cloning is a must-know skill in JavaScript
0:38 – 🔥 Quick pause - Like & Subscribe to boost your coding skills
0:52 – Understanding reference types (the root of the cloning problem)
1:42 – Shallow copy explained with simple examples
2:20 – Deep copy explained step-by-step
2:40 – Cloning with JSON stringify & parse
2:53 – Limitations of JSON methods you must know
3:45 – Building your own recursive deepClone function
4:56 – Using Lodash’s cloneDeep for quick cloning
5:34 – Modern native structuredClone in action
6:11 – Summary, tips & best practices to choose the right approach
🔥 If this video helped you finally understand deep cloning, hit that like button, drop a comment on your go-to cloning method, and subscribe to ITower for more clear, beginner-friendly dev tutorials.
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