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. ForEach is great 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?

In terms of performance, map can be slightly faster for creating new arrays, while forEach is better for executing functions without returning a new array.

Are there any situations where I should avoid using these methods?

Yes, avoid using them for large datasets where performance is critical, as traditional loops may be more efficient.