What are some examples of using map and filter in JavaScript?

What are some examples of using map and filter in JavaScript?

In JavaScript, the map method creates a new array by applying a function to each element of an array, while filter creates a new array with elements that pass a test. Would you like to see specific examples?

Yes, please provide examples for both methods.

Sure! For map, you can use it like this:

const numbers = [1, 2, 3, 4];
const doubled = numbers.map(num => num * 2);
console.log(doubled); // [2, 4, 6, 8]

And for filter:

const numbers = [1, 2, 3, 4];
const evens = numbers.filter(num => num % 2 === 0);
console.log(evens); // [2, 4]

Can you explain how these methods work internally?

Certainly! The map method iterates over each element, applies the provided function, and collects the results in a new array. The filter method checks each element against a condition and includes it in the new array only if it passes the test.