What are some common mistakes when using array methods in JavaScript?

What are some common mistakes when using array methods in JavaScript?

Some common mistakes include not understanding how methods like map, filter, and reduce work, or mutating the original array.

Can you explain how map works and what mistakes to avoid?

Sure! The map method creates a new array by applying a function to each element. A common mistake is to forget that it doesn't change the original array.

What about filter? What should I be careful about?

With filter, ensure that the callback function returns a boolean. A mistake is returning a non-boolean value, which can lead to unexpected results.

How does reduce differ from map and filter?

reduce is used to accumulate a single value from an array, while map and filter create new arrays. It's easy to misuse reduce by not providing the correct initial value.