What are immutable objects in JavaScript?

What are immutable objects in JavaScript?

Immutable objects are objects whose state cannot be modified after they are created. In JavaScript, this can be achieved using libraries like Immutable.js or by using techniques like Object.freeze.

Why would I want to use immutable objects?

Using immutable objects can help prevent unintended side effects, make your code easier to reason about, and improve performance in certain scenarios, especially in functional programming.

Can you give me an example of creating an immutable object?

Sure! You can create an immutable object using Object.freeze like this:

const obj = Object.freeze({ name: 'Alice', age: 25 });

This prevents any changes to obj.

What happens if I try to modify a frozen object?

If you try to modify a frozen object, JavaScript will silently fail in non-strict mode or throw a TypeError in strict mode.