What is the difference between an array and an object in JavaScript?

What is the difference between an array and an object in JavaScript?

In JavaScript, an array is a list-like object used to store multiple values in a single variable, while an object is a collection of key-value pairs.

Can you give me an example of each?

Sure! An array can be defined like this: let fruits = ['apple', 'banana', 'cherry']; An object can be defined like this: let car = {make: 'Toyota', model: 'Camry', year: 2020};

When should I use an array instead of an object?

Use an array when you need an ordered list of items, and use an object when you need to represent data with named properties.

Are there any performance differences between them?

Yes, arrays are optimized for numerical indexing and iteration, while objects are optimized for key-value pair access. However, the performance difference is usually negligible for small datasets.