What are JavaScript array iterators and how do they work?

What are JavaScript array iterators and how do they work?

JavaScript array iterators are methods that allow you to traverse and manipulate arrays. Common ones include forEach, map, filter, and reduce.

Can you explain how the map function works with an example?

Sure! The map function creates a new array by applying a function to each element of the original array. For example:

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

What about the filter function? How is it different from map?

The filter function creates a new array containing all elements that pass a test implemented by the provided function. Unlike map, which transforms elements, filter selects elements based on a condition. For example:

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