What are mutable and immutable types in JavaScript?

Can you explain the difference between mutable and immutable types in JavaScript?

Sure! In JavaScript, mutable types can be changed after they are created, like objects and arrays. Immutable types, like strings and numbers, cannot be changed once created.

Can you give me examples of both mutable and immutable types?

Absolutely! An example of a mutable type is an array: you can add or remove elements. An example of an immutable type is a string: once you create it, you can't change it.

What happens if I try to change an immutable type?

If you try to change an immutable type, JavaScript will create a new value instead of modifying the original. For example, concatenating a string returns a new string.

Why is it important to understand these concepts?

Understanding mutable and immutable types helps you manage memory efficiently and avoid unintended side effects in your code.