What is the difference between `Array.map()` and `Array.forEach()`?

`Array.map()` creates a new array with the results of calling a provided function on every element in the array. It is used when you want to transform the elements of an array and obtain a new array with the transformed values. `Array.forEach()`, on the other hand, executes a provided function once for each array element but does not return a new array. It is used when you want to perform side effects or operations without needing a new array. 

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

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

numbers.forEach(num => console.log(num * 2));
// Output: 2 4 6 8