When should I use arrays instead of objects in JavaScript?

When should I use arrays instead of objects in JavaScript?

You should use arrays when you need an ordered collection of items, especially when the order matters. Objects are better for key-value pairs.

Can you give me an example of when to use each?

Sure! Use an array for a list of names, like ['Alice', 'Bob', 'Charlie']. Use an object for a person's details, like {name: 'Alice', age: 25}.

What if I need to store a collection of items with unique identifiers?

In that case, you might want to use an object, where the unique identifiers can be the keys, allowing for quick access.

Are there performance differences between using arrays and objects?

Yes, arrays are optimized for numerical indexing and iteration, while objects are optimized for key-value access. It depends on your use case.