What are the differences between objects and arrays in JavaScript?

What are the differences between objects and arrays in JavaScript?

In JavaScript, objects are key-value pairs, while arrays are ordered lists of values. Objects use keys to access values, whereas arrays use indices.

Can you give me an example of each?

Sure! An object might look like this: { name: 'Alice', age: 25 }. An array would look like this: [1, 2, 3, 4].

When should I use an object instead of an array?

Use objects when you need to represent data with named properties, and use arrays when you need an ordered collection of items.

Are there any performance differences between them?

Yes, arrays are optimized for numerical indexing and iteration, while objects are better for key-value lookups.