What are the common mistakes when using map and forEach in JavaScript?

What are the common mistakes when using map and forEach in JavaScript?

One common mistake is using forEach when you need to transform an array. forEach doesn't return a new array.

Can you give me an example of that?

Sure! If you want to double the values in an array, using map would be appropriate: const doubled = arr.map(x => x * 2); But if you use forEach, it won't return anything.

What about using map with side effects?

That's another mistake! Using map for side effects can lead to confusion. It's meant for transforming data, not for executing functions that change state.

How can I avoid these mistakes?

Always choose map for transformations and forEach for iterations without needing a return value. Keep their purposes clear!