What are the best practices for using map and forEach in JavaScript?

What are the best practices for using map and forEach in JavaScript?

When using map, ensure you're transforming data into a new array. For forEach, use it for side effects, not transformations.

Can you give me an example of when to use map instead of forEach?

Sure! Use map when you want to create a new array based on the original. For instance, converting an array of numbers to their squares.

What about performance? Is one better than the other?

In terms of performance, map can be slightly slower due to creating a new array, but the difference is often negligible for small datasets.

Are there any situations where I should avoid using map?

Yes, avoid using map if you don't need a new array. If you're just executing a function for its side effects, use forEach instead.