What are map and filter functions in programming?

What are map and filter functions in programming?

Map and filter are higher-order functions that allow you to process collections of data. Map transforms each element, while filter selects elements based on a condition.

Can you give me an example of how to use the map function?

Sure! In JavaScript, you can use map like this: const numbers = [1, 2, 3]; const doubled = numbers.map(num => num * 2); This will return [2, 4, 6].

And what about the filter function?

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

Are there any performance considerations when using these functions?

Yes, both map and filter create new arrays, which can impact performance with large datasets. It's important to consider this when working with performance-sensitive applications.