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 and returning a new array. Use forEach for side effects.

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

Sure! Use map when you need to create a new array from an existing one, like converting an array of numbers to their squares.

What about performance? Is one better than the other?

Generally, map and forEach have similar performance, but map can be more efficient for transformations since it returns a new array.

Are there any common mistakes to avoid with these methods?

Yes! A common mistake is using forEach when you need to return a new array. Also, avoid mutating the original array in both methods.