What are the performance differences between forEach and map in JavaScript?

What are the performance differences between forEach and map in JavaScript?

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

So, which one is faster?

Generally, map can be faster than forEach when you need to transform data because it optimizes the creation of a new array. However, the performance difference can be negligible for small arrays.

Are there any scenarios where I should prefer forEach over map?

Yes, if you don't need to return a new array and just want to perform side effects, forEach is more appropriate.

Can you give me an example of when to use each?

Sure! Use map when you want to transform an array, like doubling numbers. Use forEach when you want to log each number without creating a new array.