When should I use map or forEach in JavaScript?

Can you explain when to use map or forEach in JavaScript?

Sure! Use map when you want to transform an array and return a new array. Use forEach when you want to execute a function on each element without returning anything.

What’s the main difference in their return values?

The main difference is that map returns a new array with the results of calling a provided function on every element, while forEach returns undefined.

Can you give me an example of each?

Of course! For map: const doubled = arr.map(num => num * 2); For forEach: arr.forEach(num => console.log(num));

Are there any performance differences between them?

Generally, map can be slightly slower due to creating a new array, but the difference is usually negligible for small arrays.