What are some examples of mutable data in JavaScript?

What are some examples of mutable data in JavaScript?

In JavaScript, mutable data types include objects and arrays. They can be changed after creation.

Can you give me an example of how to modify an array?

Sure! You can use methods like push(), pop(), or splice() to modify an array. For example, let arr = [1, 2, 3]; arr.push(4); adds 4 to the end.

What about objects? How can I change their properties?

You can change an object's properties using dot notation or bracket notation. For example, let obj = {name: 'Alice'}; obj.name = 'Bob'; changes the name.

Are there any immutable data types in JavaScript?

Yes, strings and numbers are immutable in JavaScript. Once created, their values cannot be changed.