What are the performance implications of map vs forEach?

Can you explain the performance differences between map and forEach in JavaScript?

Sure! The main difference is that map creates a new array with the results of calling a function on every element, while forEach executes a provided function once for each array element without returning anything.

So, does that mean map is generally slower because it creates a new array?

Yes, that's correct. map can be slower due to the overhead of creating a new array, especially for large datasets. However, the difference may be negligible for smaller arrays.

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

You should use forEach when you don't need a new array and just want to perform side effects, like logging or modifying external variables.

What about readability? Does one method make the code clearer?

map can often make the code more readable when you're transforming data, while forEach is clearer for operations that don't return a value. It depends on the context!