What are the differences between Set and Array in JavaScript?

What are the differences between Set and Array in JavaScript?

In JavaScript, a Set is a collection of unique values, while an Array can contain duplicate values. Sets also have different methods for adding and checking values.

Can you give me an example of how to use a Set?

Sure! You can create a Set like this: const mySet = new Set(); mySet.add(1); mySet.add(2); mySet.add(1); This will only store the unique values 1 and 2.

What about the performance differences between them?

Sets generally have better performance for operations like checking for existence of an item, as they use a hash table under the hood, while Arrays require a linear search.

Are there any methods that only Sets have?

Yes, Sets have methods like add(), delete(), and has(), which are not available on Arrays. Arrays have methods like push(), pop(), and map().