Why immutability is importatnt in mordern JavaScript?

Immutability means not changing the original data directly — instead, you create a new copy when you need to update something.

It’s important in modern JavaScript because:

1. Predictable Code – When data doesn’t change unexpectedly, your code becomes easier to understand and debug.
2. Fewer Bugs – Since the original data stays safe, you avoid side effects caused by accidental changes.
3. Easier State Management – Frameworks like React rely on immutability to detect changes and update the UI efficiently.
4. Better Performance – Immutable updates make it easier to track what changed, improving rendering and optimization.

In short, immutability helps keep your code clean, reliable, and easier to maintain — which is why it’s a key practice in modern JavaScript development.