What are some common mistakes when using the map function in JavaScript?

What are some common mistakes when using the map function in JavaScript?

Some common mistakes include not returning a value from the callback, using the wrong context, or modifying the original array.

Can you explain why not returning a value is a mistake?

Sure! If you don't return a value, the resulting array will be filled with 'undefined' for each element, which is usually not the desired outcome.

What happens if I modify the original array inside the map function?

Modifying the original array can lead to unexpected results, as the map function is intended to create a new array based on the original.

Are there any performance issues with using map incorrectly?

Yes, using map incorrectly can lead to performance issues, especially if you're creating unnecessary copies of large arrays or performing heavy computations.