What is the difference between map and filter in JavaScript?

Can you explain the difference between map and filter in JavaScript?

Sure! The map method creates a new array by applying a function to each element of the original array, while filter creates a new array containing only the elements that pass a certain condition.

Can you give me an example of how to use both methods?

Of course! For map, you might have an array of numbers and want to double each number: const doubled = numbers.map(num => num * 2);. For filter, if you want to get only even numbers: const evens = numbers.filter(num => num % 2 === 0);.

Are there any performance differences between them?

Yes, performance can vary based on the size of the array and the complexity of the function used. Generally, map and filter have similar performance, but using them together can lead to inefficiencies.

When should I use map instead of filter?

Use map when you want to transform each element of an array into a new value. Use filter when you want to remove elements based on a condition.