How do map and filter work in JavaScript?

How do map and filter work in JavaScript?

The map method creates a new array by applying a function to each element of the original array, while filter creates a new array with elements that pass a test.

Can you give me an example of using map?

Sure! If you have an array of numbers, you can use map to double each number: const doubled = numbers.map(num => num * 2);.

What about filter? How would I use that?

You can use filter to get only the even numbers from an array: const evens = numbers.filter(num => num % 2 === 0);.

Are there any performance considerations when using these methods?

Yes, both methods create new arrays, which can impact performance with large datasets. It's important to consider this when working with large arrays.