What are some examples of mutable objects in JavaScript?

What are some examples of mutable objects in JavaScript?

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

Can you give me an example of a mutable object in action?

Sure! Here's an example with an array:

let fruits = ['apple', 'banana'];
fruits.push('orange'); // Now fruits is ['apple', 'banana', 'orange']

What about objects? Can you show me an example?

Absolutely! Here's an example with an object:

let car = { brand: 'Toyota', model: 'Corolla' };
car.year = 2020; // Now car is { brand: 'Toyota', model: 'Corolla', year: 2020 }

Are there any performance considerations with mutable objects?

Yes, mutable objects can lead to unintended side effects if not managed properly, especially in larger applications.