What are the performance differences between map and filter in JavaScript?

What are the performance differences between map and filter in JavaScript?

The map method creates a new array by applying a function to each element, while filter creates a new array with elements that pass a test. Generally, map is faster because it processes each element once, whereas filter may require additional checks.

Can you provide an example of how both methods work?

Sure! For map, you might use it to double each number in an array: const doubled = arr.map(num => num * 2);. For filter, you could use it to get only even numbers: const evens = arr.filter(num => num % 2 === 0);.

Are there any scenarios where one is preferred over the other?

Yes, use map when you want to transform data and filter when you want to reduce the dataset based on a condition. Choosing the right method can improve code readability and performance.

What about their memory usage?

Both methods create new arrays, so they have similar memory usage patterns. However, if you're working with large datasets, consider the implications of creating multiple arrays.