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

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

The main difference is that map creates a new array with the results, while forEach executes a function on each element without returning anything.

So, which one is faster?

Generally, forEach can be slightly faster since it doesn't create a new array. However, the difference is often negligible for small datasets.

Are there any scenarios where I should prefer one over the other?

Yes, use map when you need to transform data and create a new array. Use forEach for side effects, like logging or modifying external variables.

What about readability? Does one have an advantage?

map can be more readable when you're transforming data, while forEach is straightforward for executing functions without returning values.