How do I use map, filter, and reduce in JavaScript?

Can you explain how to use map, filter, and reduce in JavaScript?

Sure! In JavaScript, map, filter, and reduce are array methods that help manipulate data. Would you like a brief overview of each?

Yes, please! What does each method do?

map creates a new array by applying a function to each element. filter creates a new array with elements that pass a test. reduce reduces the array to a single value based on a function.

Can you give me an example of each?

Absolutely! For map, you could use it to double each number in an array. For filter, you might get all even numbers. And for reduce, you could sum all the numbers in an array.

That sounds great! Can you show me the code for these examples?

Sure! Here’s a quick example:

const numbers = [1, 2, 3, 4, 5];

const doubled = numbers.map(num => num * 2);
const evens = numbers.filter(num => num % 2 === 0);
const sum = numbers.reduce((acc, num) => acc + num, 0);

This will give you the doubled array, the even numbers, and the sum!