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 doesn't return a new array, 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 is often negligible for small datasets.

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

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

Can you give me an example of both in action?

Sure! For forEach: array.forEach(item => console.log(item)); and for map: const newArray = array.map(item => item * 2);.