What are the best practices for using the map function in JavaScript?

What are the best practices for using the map function in JavaScript?

When using the map function, ensure that you return a new array, avoid side effects, and keep your callback function pure.

Can you explain what you mean by keeping the callback function pure?

A pure function is one that returns the same output for the same input and does not cause any side effects, like modifying external variables.

Are there any performance considerations I should be aware of?

Yes, while map is convenient, for large datasets, consider using forEach or a traditional for loop for better performance.

What about using map with asynchronous operations?

Map does not handle asynchronous operations well. For async tasks, consider using Promise.all with map or for-await-of.