Can you give an example of reduce in action?

Can you give me an example of how the reduce function works in JavaScript?

Sure! The reduce function in JavaScript is used to execute a reducer function on each element of an array, resulting in a single output value. For example, if you want to sum all the numbers in an array, you can do it like this:

const numbers = [1, 2, 3, 4];
const sum = numbers.reduce((accumulator, currentValue) => accumulator + currentValue, 0);
console.log(sum); // Output: 10

What does the accumulator do in this example?

The accumulator is the value that is returned after each iteration of the reducer function. In the sum example, it starts at 0 and accumulates the total as it processes each number in the array.

Can I use reduce for other operations, like finding the maximum value?

Absolutely! You can use reduce for various operations. For finding the maximum value, you can do it like this:

const numbers = [1, 5, 3, 9, 2];
const max = numbers.reduce((accumulator, currentValue) => Math.max(accumulator, currentValue));
console.log(max); // Output: 9