How does JavaScript handle mutable and immutable types?

Can you explain how JavaScript handles mutable and immutable types?

Sure! In JavaScript, mutable types can be changed after creation, like objects and arrays, while immutable types, like strings and numbers, cannot be altered.

Can you give me an example of a mutable type?

Absolutely! An example of a mutable type is an array. You can add, remove, or change elements in an array after it has been created.

What about an immutable type? Can you show me?

Certainly! A string is an immutable type. For instance, if you have a string 'hello', you can't change it directly; any modification creates a new string.

How does this affect performance in JavaScript?

Mutable types can be more efficient for frequent changes, while immutable types can lead to safer code but may have performance overhead due to creating new instances.