How do I use map and filter in JavaScript?

How do I use map and filter in JavaScript?

In JavaScript, map creates a new array by applying a function to each element of an existing array, while filter creates a new array with elements that pass a test.

Can you give me an example of using map?

Sure! Here's an example: const numbers = [1, 2, 3]; const doubled = numbers.map(num => num * 2); // doubled is [2, 4, 6].

What about filter? Can you show me that too?

Absolutely! For filter, you can do something like this: const numbers = [1, 2, 3, 4]; const evens = numbers.filter(num => num % 2 === 0); // evens is [2, 4].

Thanks! How do I combine both map and filter?

You can chain them! For example: const numbers = [1, 2, 3, 4]; const result = numbers.filter(num => num % 2 === 0).map(num => num * 2); // result is [4, 8].